#include <stdio.h>

void main(void)

{

   printf("This is my first C program!");

}

#include <stdio.h>

#define txt "This is my first C program!"

void main(void)

{

   printf(txt);

   printf(txt);

}

#include <stdio.h>

#define txt "This is my first C program!\n"

void main(void)

{

   printf(txt);

   printf(txt);

}

#include <stdio.h>

void main(void)

{

   char ch=0;

   printf("Please enter a number:\n");

   scanf("%d",&ch);

   printf("\nYou've entered the number %d",ch);

}

#include <stdio.h>

void main(void)

{

   int a=0,b=0;

   printf("Please enter two numbers:\n");

   scanf("%d %d",&a, &b);

   printf("\n%d + %d = %d",a,b,a+b);

   printf("\n%d - %d = %d",a,b,a-b);

   printf("\n%d * %d = %d",a,b,a*b);

   printf("\n%d / %d = %d",a,b,a/b);

}

#include <stdio.h>

void main(void)

{

   int a=0,b=0;

   printf("Please enter two numbers:\n");

   scanf("%d %d",&a, &b);

   printf("\n%d + %d = %d",a,b,a+b);

   printf("\n%d - %d = %d",a,b,a-b);

   printf("\n%d * %d = %d",a,b,a*b);

   if(a!=b)

      printf("\n%d / %d = %d",a,b,a/b);

}

#include <stdio.h>

void main(void)

{

   int a=0,b=0;

   printf("Please enter two numbers:\n");

   scanf("%d %d",&a, &b);

   printf("\n%d + %d = %d",a,b,a+b);

   printf("\n%d - %d = %d",a,b,a-b);

   printf("\n%d * %d = %d",a,b,a*b);

   if(a!=b)

      printf("\n%d / %d = %d",a,b,a/b);

   else

      printf("\nError! Division in zero!");

}

#include <stdio.h>

void main(void)

{

   int a=0;

   printf("Please enter a number:\n");

   scanf("%d",&a);

   if(a>=0 && a<=9)

      printf("\nThis is a digit.");

   else

      printf("\nThis is not a digit.");

}

#include <stdio.h>

void main(void)

{

   int a=0;

   printf("Please enter a number:\n");

   scanf("%d",&a);

   if(a<0 || a>9)

      printf("\nThis is not a digit.");

   else

      printf("\nThis is a digit.");

}

#include <stdio.h>

void main(void)

{

   int a=0;

   printf("Please enter a number:\n");

   scanf("%d",&a);

   if(a>=0 && a<=5 || a>5 && a<=9)

      printf("\nThis is a digit.");

   else

      printf("\nThis is not a digit.");

}

#include <stdio.h>

void main(void)

{

   char a=0;

   printf("Please enter a character:\n");

   scanf("%c",&a);

   if(a>='A' && a<='Z' || a>='a' && a<='z')

   {

      printf("\n%c is an English character!!!", a);

      printf("\nThis was a sample of a block...");

      printf("\nBlock is done... Nothing to see here...");

   }

   else

      printf("\n%c is not an English character... Sorry!", a);

}

#include <stdio.h>

void main(void)

{

   int i;

   for(i=1;i<=7;i++)

      printf("Hello!!! This is line #%d\n",i);

}

#include <stdio.h>

void main(void)

{

   int i;

   for(i=1;i<=7;i=i+1)

      printf("Hello!!! This is line #%d\n",i);

}

#include <stdio.h>

void main(void)

{

   int num=0;

   printf("Please enter a number:\n");

   scanf("%d",&num);

   while(num<10)

   {

      printf("\nYour number is less than 10!!!");

      printf("Please enter a number:\n");

      scanf("%d",&num);

   }

}

#include <stdio.h>

void main(void)

{

   int num=2;

   do

   {

      printf("\nPlease enter a number:\n");

      scanf("%d",&num);

   } while(num%2==0);

}

#include <stdio.h>

#include <conio.h>

void main(void)

{

   char ch=0;

   printf("Enter a character:\n");

   ch=getch();

   clrscr();

   printf("\nYour character: %c\nAscii code: %d", ch, ch);

}

#include <stdio.h>

#include <conio.h>

void main(void)

{

   int i;

   clrscr();

   for(i=0;i<=15;i++)

   {

      textcolor(i);

      cprintf("%d\n",i);

   }

}

#include <stdio.h>

#include <conio.h>

void main(void)

{

   textcolor(15);

   textbackground(9);

   window(5,5,75,20);

   clrscr();

   cprintf("This is a test...");

   getch();

   clreol();

   clrscr();

   cprintf("This is also a test...");

}

#include <stdio.h>

#include <stdlib.h>

void main(void)

{

   int a;

   randomize();

   a=random(101);

   printf("%d",a);

}

#include <stdio.h>

#include <stdlib.h>

void main(void)

{

   int a;

   randomize();

   a=random(101)+100;

   printf("%d",a);

}

#include <stdio.h>

void main(void)

{

   int a[7];

   for(i=1;i<=7;i++)

      scanf("%d",&a[i]);

}

#include <stdio.h>

void main(void)

{

   int a[3][3],i,k,b=1;

   for(i=1;i<=3;i++)

   {

      for(k=1;k<=3;k++)

      {

         printf("\nPlease enter row #%d, col #%d: ",i,k);

         scanf("%d",&a[i][k]);

      }

   }

   for(i=1;i<=3;i++)

   printf("\nSum of #%d row: %d.",i,a[i]+a[i+1]+a[i+2]);

}

#include <stdio.h>

void main(void)

{

   char a[255]="";

   printf("Please write your name: ");

   scanf("%s",&a);

   printf("\nYour name is: &s",a);

}

#include <stdio.h>

#include <string.h>

void main(void)

{

   char a[255]="";

   printf("Please write your name: ");

   gets(a);

   printf("\nYour name is: ");

   puts(a);

}

#include <stdio.h>

#include <string.h>

void main(void)

{

   int i;

   char a[255]="";

   printf("Please write a string: ");

   gets(a);

   for(i=1;i<=strlen(a);i++)

      if(a[i]>='A' && a[i]<='Z')

         a[i]=a[i]+32;

   printf("\nLowercased new string: ");

   puts(a);

}

#include <stdio.h>

int addnums(int a, int b)

{

   int c;

   c=a+b;

   return c;

}

#include <stdio.h>

int addnums(int a, int b)

{

   return a+b;

}

#include <stdio.h>

void main(void)

{

   printf("%d",addnums(5,7));

}

int addnums(int a, int b)

{

   return a+b;

}

#include <stdio.h>

int addnums(int a, int b)

{

   return a+b;

}

void main(void)

{

   printf("%d",addnums(5,7));

}

#include <stdio.h>

int addnums(int a, int b);

void main(void)

{

   printf("%d",addnums(5,7));

}

int addnums(int a, int b)

{

   return a+b;

}