C - If...else Control Statements

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The if statement can response only the true condition. In case of if...else statement, it can response in both conditions such as true and false.

Syntax

	if(conditional-expression)
                  /* statements can be executed only the conditional_expression is true */
          statement1;
	else
                  /* statements can be executed only the conditional_expression is false*/
         statement2;

	if (conditional_expression){
                /* statements can be executed only the conditional_expression is true */
          compound statements;
	}else {
           /* statements can be executed only the conditional_expression is false */
        compound statements;
	}

The if..else statement checks whether the condition is true or false. If the condition is true, then the if block will be executed. If the condition is false, then the else block will be executed.

Flow Chart

Example C Program for if..else statement

#include <stdio.h>
#include <conio.h>

int main()
{
	int A=25;
	int B=40;
	if (A > B){
		printf("The A value is greater than B \n");
		A = A - 5;
	}
	else {
		printf("The A value is not greater than B \n");
		A = A + 5;
	}
	printf("The A value is: %d \n The B value is :%d",A,B);
	return(0)
}

Output

The A value is not greater than B
The A value is:30
The B value is:40

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