C "If else statements" also control the program flow based on conditions such as "if statements"; the only difference is that it executes some statement code block if the expression is true; otherwise, it executes the else statement code block.
The basic format of if else Statement is:
Syntax:
if(test_expression)
{
//execute your code
}
else
{
//execute your code
}Figure - Flowchart of if-else Statement:
Example of a C Program to Demonstrate if-else Statement
Example:
#include<stdio.h>
void main()
{
int a, b;
printf("Please enter the value for a:");
scanf("%d", &a);
printf("\nPlease the value for b:");
scanf("%d", &b);
if (a > b) {
printf("\n a is greater");
} else {
printf("\n b is greater");
}
}Program Output:
Example:
#include<stdio.h>
void main() {
int num;
printf("Enter the number:");
scanf("%d", &num);
/* check whether the number is negative number */
if (num < 0)
printf("The number is negative.");
else
printf("The number is positive.");
}Program Output:
if-else Statements in C - Video Tutorial
Please watch this video tutorial to understand "C if-else Statements" in more depth.