# Learn C - C break

We can use the break statement to exit the for loop.

This example computes the average of an arbitrary number of values:

``````
#include <stdio.h>
#include <ctype.h>                    // For tolower() function
/* w ww . j a va  2 s .  c  om*/
int main(void)
{
char answer = 'N';                  // Decision to continue the loop
double total = 0.0;
double value = 0.0;
unsigned int count = 0;

for( ;; )                           // Indefinite loop
{
printf("\nEnter a value: ");      // Prompt for the next value
scanf(" %lf", &value);            // Read the next value
total += value;                   // Add value to total
++count;                          // Increment count of values

// check for more input
printf("Do you want to enter another value? (Y or N): ");

if(tolower(answer) == 'n')        // look for any sign of no
break;                          // Exit from the loop
}
// Output the average to 2 decimal places
printf("\nThe average is %.2lf\n", total/count);
return 0;
}
``````

The code above generates the following result.

## Example

uses break to exit a loop

``````
#include <stdio.h>
int main(void)
{//from www. ja  va 2  s .  co m
float length, width;

printf("Enter the length of the rectangle:\n");
while (scanf("%f", &length) == 1)
{
printf("Length = %0.2f:\n", length);
printf("Enter its width:\n");
if (scanf("%f", &width) != 1)
break;
printf("Width = %0.2f:\n", width);
printf("Area = %0.2f:\n", length * width);
printf("Enter the length of the rectangle:\n");
}

return 0;
}
``````

The code above generates the following result.

## Example 2

uses a switch statement and break

``````
#include <stdio.h>
#include <ctype.h>
int main(void)
{/*from  w ww.  j  a  v  a  2s. co m*/
char ch;

printf("Please type in a letter; type # to end.\n");
while ((ch = getchar()) != '#')
{
if('\n' == ch)
continue;
if (islower(ch))     /* lowercase only          */
switch (ch)
{
case 'a' :
printf("a\n");
break;
case 'b' :
printf("b\n");
break;
case 'c' :
printf("c\n");
break;
case 'd' :
printf("d\n");
break;
case 'e' :
printf("e\n");
break;
case 'f' :
printf("f\n");
break;
default :
printf("That's a stumper!\n");
}                /* end of switch           */
else
printf("only lowercase letters.\n");
while (getchar() != '\n')
continue;      /* skip rest of input line */
printf("Please type another letter or a #.\n");
}                        /* while loop end          */

return 0;
}
``````

The code above generates the following result.