C Conditional Statement: IF, IF Else and
Nested IF Else with Example
What is a Conditional Statement in C?
Conditional Statements in C programming are used to make decisions based
on the conditions. Conditional statements execute sequentially when there is
no condition around the statements. If you put some condition for a block of
statements, the execution flow may change based on the result evaluated by
the condition. This process is called decision making in โC.โ
In โCโ programming conditional statements are possible with the help of the
following two constructs:
1. If statement
2. If-else statement
It is also called as branching as a program decides which statement to execute
based on the result of the evaluated condition.
If statement
It is one of the powerful conditional statement. If statement is responsible for
modifying the flow of execution of a program. If statement is always used with a
condition. The condition is evaluated first before executing any statement
inside the body of If. The syntax for if statement is as follows:
if (condition)
instruction;
The condition evaluates to either true or false. True is always a non-zero value,
and false is a value that contains zero. Instructions can be a single instruction or
a code block enclosed by curly braces { }.
Following program illustrates the use of if construct in โCโ programming:
#include<stdio.h>
int main()
{
int num1=1;
int num2=2;
if(num1<num2) //test-condition
{
printf("num1 is smaller than num2");
}
return 0;
