if Statements with Compound Statements :

When multiple statements must be executed as a result of a single condition, a
compound statement is used. A compound statement consists of a group of
statements enclosed within braces {} and is treated as a single unit by the
if statement.

Compound statements allow the programmer to execute several actions whenever a
condition evaluates to true, thereby improving program clarity and logical
organization.

EXAMPLE:

#include<stdio.h>
int a=300;
int main(){
    if(a>=100){
        printf("Hi\n");
        printf("a is greater than or equal to 100",a);
    }
   return 0; 
}

Output:

Hi
a is greater than or equal to 100