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Hello World

#include<stdio.h>

int main ()
{
    printf("Hello World");
    return 0;
}

a + b

#include<stdio.h>

int main ()

{

    int x, y, z;

    printf("Enter the valu of x and than y\n");

    scanf("%d %d",&x, &y);

    z = x + y;

    printf("The value of %d + %d equals %d\n", x, y, z);

    return 0;

}

Character

#include<stdio.h>

int main ()
{
    char ch;
    printf("Enter a character\n");
    scanf("%c", &ch);
    printf("The character your entered: %c\n", ch);
    return 0;
}

Even & Odd

#include<stdio.h>

int main ()
{
    int x, y;
    printf("Enter a number:");
    scanf("%d", &x);
    y = x%2;

    if (y == 0){
        printf("The number is even\n");
    }
    else {
        printf("The number is odd\n");
    }
    return 0;
}

Vowel

#include<stdio.h>

int main ()
{
    char ch;
    scanf("%c", &ch);

    if (ch == 'a'){
        printf("vowel\n");
    }
    if (ch == 'e'){
        printf("vowel\n");
    }
    if (ch == 'i'){
        printf("vowel\n");
    }
    if (ch == 'o'){
        printf("vowel\n");
    }
    if (ch == 'u'){
        printf("vowel\n");
    }
    if (ch == 'A'){
        printf("vowel\n");
    }
    if (ch == 'E'){
        printf("vowel\n");
    }
    if (ch == 'I'){
        printf("vowel\n");
    }
    if (ch == 'O'){
        printf("vowel\n");
    }
    if (ch == 'U'){
        printf("vowel\n");
    }
    return 0;
}

Char 2

#include<stdio.h>

int main ()
{
    char ch;
    scanf("%c", &ch);

    if (ch == '1' || ch == '2' || ch == '3' || ch == '4' || ch == '5' || ch == '6' || ch == '7' || ch == '8' || ch == '9' || ch == '0'){
        printf("didit\n");
    }
    else{
        printf("not a digit\n");
    }
    return 0;
}

Char

#include<stdio.h>

int main ()
{
    char ch;
    scanf("%c", &ch);

    if (ch >= '0' && ch <= '9'){
        printf("didit\n");
    }
    else{
        printf("not a digit\n");
    }
    return 0;
}

Greater

#include<stdio.h>

int main ()
{
    int n;
    scanf("%d", &n);

    if (n > 10){
        printf("%d is greater then 10\n", n);
    }
    if (n > 5){
        printf("%d is greater then 5\n", n);
    }
    return 0;
}

Grade

#include<stdio.h>

int main ()
{
    int marks;
    char grade;
    scanf("%d", &marks);

    if(marks >= 80){
        grade = 'A+';
        printf("Your grade is %c\n", grade);
    }
    else if(marks >= 70){
        grade = 'A';
        printf("Your grade is %c\n", grade);
    }
    else if(marks >= 60){
        grade = 'B';
        printf("Your grade is %c\n", grade);
    }
    else if(marks >= 50){
        grade = 'c';
        printf("Your grade is %c\n", grade);
    }
    else if(marks >= 40){
        grade = 'D';
        printf("Your grade is %c\n", grade);
    }
    else{
        printf("Your grade is F");
    }
    return 0;
}

Loooooop

#include<stdio.h>

int main ()
{
    printf("1\n");
    printf("2\n");
    printf("3\n");
    printf("4\n");
    printf("5\n");
    printf("6\n");
    printf("7\n");
    printf("8\n");
    printf("9\n");
    printf("10\n");
    return 0;
}

Loop

#include<stdio.h>

int main ()
{
    int n = 1;
    printf("%d\n",n);
    n = n + 1;
    printf("%d\n",n);
    n = n + 1;
    printf("%d\n",n);
    n = n + 1;
    printf("%d\n",n);
    n = n + 1;
    printf("%d\n",n);
    n = n + 1;
    printf("%d\n",n);
    n = n + 1;
    printf("%d\n",n);
    n = n + 1;
    printf("%d\n",n);
    n = n + 1;printf("%d\n",n);
    n = n + 1;
    printf("%d\n",n);
    return 0;
}

Odd

#include<stdio.h>

int main ()
{
    int n;
    n = 1;
    while (n <= 100){
        printf("%d\n",n);
        n = n + 1;
    }
    return 0;
}

Even

#include<stdio.h>

int main ()
{
    int n;
    n = 2;
    while(n <= 100){
        printf("%d\n",n);
        n = n + 2;
    }
    return 0;
}

About ( Mukdho )

#include<stdio.h>
int main ()
{
    printf("\n\n\t\t\t      About GPA Finder Soft\n\n");
    printf("\t=============================================================\n");
    printf("\tName: GPA FINDER SOFT\n");
    printf("\tPublished: 20/08/2013\n");
    printf("\tVerson: 5.1\n\n");
    printf("\tDeveloped By : Subber Islam Mukdo\n");
    printf("\tE-mail: bmukdo@gmail.com\n");
    printf("\tWEB: mukdo.blogspot.com\n\n");
    printf("\tDeveloped By : Raihan Neshat\n");
    printf("\tE-mail: raihanneshat.bd@gmail.com\n");
    printf("\tWEB: neshatbd.blogspot.com\n\n");
    printf("\tSaadakaalo Software Studio\n");
    printf("\tWEB: saadakaalo.blogspot.com\n");
    printf("\t=============================================================\n\n");
    printf("\t\t    *** BAKERGONJ J,S,U MODEL HIGH SCHOOL ***\n");
    printf("\t\t\t\t     ESTD:1919\n");
    printf("\t\t   Bakergonj Sadar Road , Barisal , Bangladesh\n");
    getch ();
    return 0;
}

Bangla Number (Sourav Da)

//challenge
#include<stdio.h>
#include<string.h>


int main()
{
     int len,mod,i,j,k,loop,flag,flag7,flag5,flag2;
     char str[100];
     while(scanf(" %s",str) == 1)
     {
          len = strlen(str);
          j=0;
          while(str[j] == '0') //this loop is for eluminating leading 0's.
          {
               if(len == 1)//if the number is 0,then last digit will be kept.
               break;
               len--;
               j++;
          }

          loop=(len+6)/7;
          mod = len %7;

          if(mod == 0)
          mod = 7;
          flag=0;

          for(i=0; i<loop; i++)
          {
                    flag7=flag5=flag2=0;

                    if(i) //kuti will not be printed in first time.
                    {
                         printf(" kuti");
                         flag =1;
                    }

                    if(mod == 7) //such if is used to determine the starting point of the number
                    {
                         mod--;
                         if(str[j] != '0')
                         {
                              if(flag)
                              {
                                   putchar(' ');
                                   flag=0;
                              }
                              printf("%c",str[j]);
                              flag7 = 1;
                         }
                         j++;
                    }
                   if(mod == 6)
                   {
                        mod --;
                        if(str[j] != '0' ||  flag7) {
                             if(flag)
                              {
                                   putchar(' ');
                                   flag=0;
                              }

                        printf("%c lakh",str[j]);
                        j++;
                        flag =1;
                        }
                   }

                   if(mod == 5)
                    {
                         mod--;
                         if(str[j] != '0')
                         {
                              if(flag)
                              {
                                   putchar(' ');
                                   flag=0;
                              }
                              printf("%c",str[j]);
                              flag5 = 1;
                         }
                         j++;
                    }
                   if(mod == 4)
                   {
                        mod --;
                        if(str[j] != '0' ||  flag5) {
                             if(flag)
                              {
                                   putchar(' ');
                                   flag=0;
                              }
                        printf("%c hajar",str[j]);
                        }
                        j++;
                        flag =1;
                   }

                   if(mod == 3)
                   {
                        mod--;
                        if(str[j] != '0') {
                             if(flag)
                              {
                                   putchar(' ');
                                   flag=0;
                              }
                        printf("%c shata",str[j]);

                        flag =1;
                        }
                        j++;
                   }

                   if(mod == 2)
                   {
                        mod--;
                        if(str[j] != '0')
                        {
                             if(flag)
                              {
                                   putchar(' ');
                                   flag=0;
                              }
                              printf("%c",str[j]);
                              flag2=1;
                        }
                        j++;
                   }

                   if(mod == 1)
                   {
                        mod = 7;
                        if(flag2 ==1 || str[j] != '0' || len == 1)
                        {
                             if(flag)
                              {
                                   putchar(' ');
                                   flag=0;
                              }
                             printf("%c",str[j]);
                        }
                        j++;
                    }
                    if(i && loop==(i-1)) { //last koti will print.
                    printf(" kuti");
                    flag = 1;
                    }

          }
          putchar('\n');
     }
    return main();
}

for loop

#include<stdio.h>

int main ()
{
    int n;
    n = 1;
    while(n < 1000000){
        printf("%d\t", n);
        n = n + 5;
    }
    return 0;
}

GPA

#include<stdio.h>

int main()
{
    float a,a1,a2,a3,a4,Bangla,English,Math,Religion,Physich,Compulsory,Chemistry,SocalScience,Optional;
    float c,ekual,full;

        printf("\n\n\n\n\n\t\t\t\t>GPA FINDER SOFT<");
        printf("\n\n\t\t     ***BAKERGONJ J,S,U MODEL HIGH SCHOOL***\n\n");
        printf("\t\t     =======================================");
        printf("\n\n\tEnter Your Bangla 1st paper number :");
        scanf("%f",&a);
        if(a>=80 && a<=100)
            Bangla = 5;
        else if(a>=70 && a<80)
            Bangla = 4;
        else if(a>=60 && a<70)
            Bangla = 3.50;
        else if(a>=50 && a<60)
            Bangla = 3;
        else if(a>=40 && a<50)
            Bangla = 2;
        else if(a>=33 && a<40)
            Bangla = 1;
        printf("\t=>your great in bangla 1st paper : %0.2f",Bangla);
        printf("\n\n\tEnter Your Bangla 2nd paper number :");
        scanf("%f",&a);
        if(a>=80 && a<=100)
            Bangla = 5;
        else if(a>=70 && a<80)
            Bangla = 4;
        else if(a>=60 && a<70)
            Bangla = 3.50;
        else if(a>=50 && a<60)
            Bangla = 3;
        else if(a>=40 && a<50)
            Bangla = 2;
        else if(a>=33 && a<40)
            Bangla = 1;
        printf("\t=>your great in Bangla 2nd paper : %0.2f",Bangla);
        printf("\n\n\tEnter Your English 1st paper number :");
        scanf("%f",&a1);
        if(a1>=80 && a1<=100)
            English = 5;
        else if(a1>=70 && a1<80)
            English = 4;
        else if(a1>=60 && a1<70)
            English = 3.50;
        else if(a1>=50 && a1<60)
            English = 3;
        else if(a1>=40 && a1<50)
            English = 2;
        else if(a1>=33 && a1<40)
            English = 1;
        printf("\t=> your great in English 1st paper : %0.2f",English);
        printf("\n\n\tEnter Your English 2nd paper number :");
        scanf("%f",&a1);
        if(a1>=80 && a1<=100)
            English = 5;
        else if(a1>=70 && a1<80)
            English = 4;
        else if(a1>=60 && a1<70)
            English = 3.50;
        else if(a1>=50 && a1<60)
            English = 3;
        else if(a1>=40 && a1<50)
            English = 2;
        else if(a1>=33 && a1<40)
            English = 1;
        printf("\t=> your great in English 2nd paper : %0.2f",English);
        printf("\n\n\tEnter Your Math number :");
        scanf("%f",&a2);
        if(a2>=80 && a2<=100)
            Math = 5;
        else if(a2>=70 && a2<80)
            Math = 4;
        else if(a2>=60 && a2<70)
            Math = 3.50;
        else if(a2>=50 && a2<60)
            Math = 3;
        else if(a2>=40 && a2<50)
            Math = 2;
        else if(a2>=33 && a2<40)
            Math = 1;
        printf("\t=> your great in Math : %0.2f",Math);
        printf("\n\n\tEnter Your Religion number :");
        scanf("%f",&a3);
        if(a3>=80 && a3<=100)
            Religion = 5;
        else if(a3>=70 && a3<80)
            Religion = 4;
        else if(a3>=60 && a3<70)
            Religion = 3.50;
        else if(a3>=50 && a3<60)
            Religion = 3;
        else if(a3>=40 && a3<50)
            Religion = 2;
        else if(a3>=33 && a3<40)
            Religion = 1;
        printf("\t=> your great in Religion : %0.2f",Religion);
        printf("\n\n\tEnter Your Physich number :");
        scanf("%f",&a4);
        if(a4>=80 && a4<=100)
            Physich = 5;
        else if(a4>=70 && a4<80)
            Physich = 4;
        else if(a4>=60 && a4<70)
            Physich = 3.50;
        else if(a4>=50 && a4<60)
            Physich = 3;
        else if(a4>=40 && a4<50)
            Physich = 2;
        else if(a4>=33 && a4<40)
            Physich = 1;
        printf("\t=> your great in Physich : %0.2f",Physich);
        printf("\n\n\tEnter Your Compulsory Sub number :");
        scanf("%f",&a);
        if(a>=80 && a<=100)
            Compulsory = 5;
        else if(a>=70 && a<80)
            Compulsory = 4;
        else if(a>=60 && a<70)
            Compulsory = 3.50;
        else if(a>=50 && a<60)
            Compulsory = 3;
        else if(a>=40 && a<50)
            Compulsory = 2;
        else if(a>=33 && a<40)
            Compulsory = 1;
        printf("\t=> your great in Compulsory : %0.2f",Compulsory);
        printf("\n\n\tEnter Your Chemistry number :");
        scanf("%f",&a);
        if(a>=80 && a<=100)
            Chemistry = 5;
        else if(a>=70 && a<80)
            Chemistry = 4;
        else if(a>=60 && a<70)
            Chemistry = 3.50;
        else if(a>=50 && a<60)
            Chemistry = 3;
        else if(a>=40 && a<50)
            Chemistry = 2;
        else if(a>=33 && a<40)
            Chemistry = 1;
        printf("\t=> your great in chemistry : %0.2f",Chemistry);
        printf("\n\n\tEnter Your Socal Science number :");
        scanf("%f",&a);
        if(a>=80 && a<=100)
            SocalScience = 5;
        else if(a>=70 && a<80)
            SocalScience = 4;
        else if(a>=60 && a<70)
            SocalScience = 3.50;
        else if(a>=50 && a<60)
            SocalScience = 3;
        else if(a>=40 && a<50)
            SocalScience = 2;
        else if(a>=33 && a<40)
            SocalScience = 1;
        printf("\t=> your great in Socal Science : %0.2f",SocalScience);
        printf("\n\n\tEnter Your Optional sub number :");
        scanf("%f",&a1);
        if(a1>=80 && a1<=100)
            Optional = 3;
        else if(a1>=70 && a1<80)
            Optional = 2;
        else if(a1>=60 && a1<70)
            Optional = 1.50;
        else if(a1>=50 && a1<60)
            Optional = 1;
        else if(a1>=40 && a1<50)
            Optional = 0;
        else if(a1>=33 && a1<40)
            Optional = 0;
        printf("\t=> your great in Optional sub : %0.2f",Optional);
        ekual=Bangla+English+Math+Religion+Physich+Compulsory+Chemistry+SocalScience+Optional;
        full=ekual/8;
        if(full>=5||full>=5.00)
            printf("\n\n\t\t    => => =>   YOUR TOTAL GREAT IS : A+  <= <= <=  \n\n                 => => =>   YOUR TOTAL POINT IS : 5.00");
        else if (full>=4 ||full>=4.00)
            printf("\n\n\t\t    => => =>   YOUR TOTAL GREAT IS : A  <= <= <=  \n\n                  => => =>   YOUR TOTAL POINT IS : %0.2f",full);
        else if (full>=3.50 ||full>=3.50)
            printf("\n\n\t\t    => => =>   YOUR TOTAL GREAT IS : A-  <= <= <=  \n\n                 => => =>   YOUR TOTAL POINT IS : %0.2f",full);
        else if (full>=3 ||full>=3.00)
            printf("\n\n\t\t    => => =>   YOUR TOTAL GREAT IS : B  <= <= <=  \n\n                  => => =>   YOUR TOTAL POINT IS : %0.2f",full);
        else if (full>=2 ||full>=2.00)
            printf("\n\n\t\t    => => =>   YOUR TOTAL GREAT IS : C  <= <= <=  \n\n                  => => =>   YOUR TOTAL POINT IS : %0.2f",full);
        else if (full>=1 ||full>=1.00)
            printf("\n\n\t\t    => => =>   YOUR TOTAL GREAT IS : D  <= <= <=  \n\n                  => => =>   YOUR TOTAL POINT IS : %0.2f",full);
        printf("     <= <= <=");
        printf("\n\n\t\t   GREATFUL : JM NADIRA AKTER & RAWSHONRA BEGUME\n");
        printf("\n\t*** DEVELOPED BY BAKERGONJ J,S,U MODEL HIGH SCHOOL COMPUTER LAB ***\n\n");
        printf("\t\t\t\t S,S,C 2012-2014\n");
        printf("\n\t===================================================================\n");
        printf("\n\t===================================================================");

    return main();
}