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If in Decision Statements of Programming in C
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If statement 
Simple IF statement is used to execute particular statements with certain conditions. It controls the flow of statement execution. If given condition is true then the block of statements will get executed.
Syntax 
if (condition or expression)
{
    statements;
}
IF example
#include
//To check given no is even number
void main(){
    int num;
    printf("Enter a number to check given number is even\n");
    scanf("%d",&num);
    if ((num % 2) == 0){
        printf("Given Number is even:%d",num);
    }
}
Output 
Enter a number to check given number is even
12

Given Number is even:12
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