Simple Examples
Example 1: Prints Hello World
#include <stdio.h>
int main()
{
printf( "Hello World\n" );
return 0;
}
Example 2: Declare Variables
#include <stdio.h>
int main()
{
int x;
printf( "Declare x first\n" );
return 0;
}
Example 3: If Else
#include <stdio.h>
int main() /* Most important part of the program! */
{
int age; /* Need a variable... */
printf( "Please enter your age" ); /* Asks for age */
scanf( "%d", &age ); /* The input is put in age */
if ( age < 100 ) { /* If the age is less than 100 */
printf ("You are pretty young!\n" ); /* Just to show you it works... */
}
else if ( age == 100 ) { /* I use else just to show an example */
printf( "You are old\n" );
}
else {
printf( "You are really old\n" ); /* Executed if no other
statement is */
}
return 0;
}
Example 4: For Loop
#include <stdio.h>
int main()
{
int x;
/* The loop goes while x < 10, and x increases by one every loop*/
for ( x = 0; x < 10; x++ ) {
/* Keep in mind that the loop condition checks
the conditional statement before it loops again.
consequently, when x equals 10 the loop breaks.
x is updated before the condition is checked. */
printf( "%d\n", x );
}
getchar();
}
Example 5: While Loop
#include <stdio.h>
int main()
{
int x;
/* The loop goes while x < 10, and x increases by one every loop*/
for ( x = 0; x < 10; x++ ) {
/* Keep in mind that the loop condition checks
the conditional statement before it loops again.
consequently, when x equals 10 the loop breaks.
x is updated before the condition is checked. */
printf( "%d\n", x );
}
getchar();
}
Example 6: Do While Loop
#include <stdio.h>
int main()
{
int x;
x = 0;
do {
/* "Hello, world!" is printed at least one time
even though the condition is false*/
printf( "%d\n", x );
} while ( x != 0 );
getchar();
}
