/*Counter-controlled repetition, print numbers from 1 to 10 */
#include <stdio.h>

int main()
{
int counter = 1; /* initialization */

while ( counter <= 10 ) { /* repetition condition */
printf ( "%d\n", counter );
++counter; /* increment */
}

return 0;
}		 /*Counter-controlled repetition with the for structure ,print numbers from 1 to 10 */
#include <stdio.h>

int main()
{
int counter;

/* initialization, repetition condition, and increment
are all included in the for structure header */
for ( counter = 1; counter <= 10; counter++ )
printf( "%d\n", counter );

return 0;
}
/* Using the do/while repetition structure ,print numbers from 1 to 10 */
#include <stdio.h>

int main()
{
int counter = 1;

do {
printf( "%d ", counter );
} while ( ++counter <= 10 );

return 0;
}		 /* calculate the sum of even numbers between 2 and 100  */

#include <stdio.h>

int main()
{
int sum = 0, number;

for ( number = 2; number <= 100; number += 2 )
sum += number;

printf( "Sum is %d\n", sum );

return 0;
}
/* Using the break statement in a for structure */
#include <stdio.h>

int main()
{
int x;

for ( x = 1; x <= 10; x++ ) {

if ( x == 5 )
    break; /* break loop only if x == 5 */

printf( "%d ", x );
}

printf( "\nBroke out of loop at x == %d\n", x );
return 0;
}		 /*Using the continue statement in a for structure */
#include <stdio.h>

int main()
{
int x;

for ( x = 1; x <= 10; x++ ) {

if ( x == 5 )
   continue; /* skip remaining code in loop only
if x == 5 */

printf( "%d ", x );
}

printf( "\nUsed continue to skip printing the value 5\n" );
return 0;
}
/* Calculating compound interest */
#include <stdio.h>
#include <math.h>

int main()
{
int year;
double amount, principal = 1000.0, rate = .05;

printf( "%4s%21s\n", "Year", "Amount on deposit" );

for ( year = 1; year <= 10; year++ ) {
 amount = principal * pow( 1.0 + rate, year );
 printf( "%4d%21.2f\n", year, amount );
}

return 0;
}		 /*Print a shape */

#include <stdio.h>

int main()
{
int row, col, x, y;

printf( "Enter integers in the range 1-20: " );
scanf( "%d%d", &x, &y );

for ( row = 1; row <= y; row++ )/*Repeating loop*/
{
for ( col = 1; col <= x; col++ )
printf( "@" ); /*print loop*/

printf( "\n" );
}

return 0;
}
/* Counting letter grades until the user press ctrl +d (=EOF) */
#include <stdio.h>

int main()
{
int grade;
int aCount = 0, bCount = 0, cCount = 0,
dCount = 0, fCount = 0;

printf( "Enter the letter grades.\n" );
printf( "Enter the EOF character to end input.\n" );

while ( ( grade = getchar() ) != EOF ) {

switch ( grade ) { /* switch nested in while */

case 'A': case 'a': /* grade was uppercase A */
++aCount; /* or lowercase a */
break;

case 'B': case 'b': /* grade was uppercase B */
++bCount; /* or lowercase b */
break;

case 'C': case 'c': /* grade was uppercase C */
++cCount; /* or lowercase c */
break;

case 'D': case 'd': /* grade was uppercase D */
++dCount; /* or lowercase d */
break;

case 'F': case 'f': /* grade was uppercase F */
++fCount; /* or lowercase f */
break;

case '\n': case' ': /* ignore these in input */
break;

default: /* catch all other characters */
printf( "Incorrect letter grade entered." );
printf( " Enter a new grade.\n" );
break;
}
}

printf( "\nTotals for each letter grade are:\n" );
printf( "A: %d\n", aCount );
printf( "B: %d\n", bCount );
printf( "C: %d\n", cCount );
printf( "D: %d\n", dCount );
printf( "F: %d\n", fCount );