Nested if else in C Programming Examples || If-Else in C

What is a Nested if-else Statement?

A nested if-else the statement is simply an if-else statement placed inside another if or else block. This is typically used when you need to make a series of decisions that depend on each other.

Syntax

if (condition1) {
// Executes if condition1 is true
if (condition2) {
// Executes if condition2 is true
} else {
// Executes if condition2 is false
}
} else {
// Executes if condition1 is false
}

Example 1: Checking the Largest of Three Numbers

#include <stdio.h>

int main() {
    int num1, num2, num3;
printf("Enter three numbers: ");
scanf("%d %d %d", &num1, &num2, &num3);

if (num1 >= num2) {
    if (num1 >= num3) {
        printf("The largest number is: %d\n", num1);
    } else {
        printf("The largest number is: %d\n", num3);
    }
} else {
    if (num2 >= num3) {
        printf("The largest number is: %d\n", num2);
    } else {
        printf("The largest number is: %d\n", num3);
    }
}

return 0;}

Explanation:

• The program first checks if num1 >= num2. If true, it then checks if num1 >= num3.
  • If num1 >= num3 is also true, num1 is the largest.
  • Otherwise, num3 is the largest.
• If num1 >= num2 is false, it checks whether num2 >= num3.
  • If true, num2 is the largest.
  • Otherwise, num3 is the largest.

Example 2: Nested if else in c programming examples

#include <stdio.h>
int main()
{ int s;
    printf ("enter your score =");
    scanf("%d",&s);

    if(s>=80 && s<=100){
        printf("A+");
    }
else if(s>=75 && s<=79){



printf("A= 3.75");
}

else if(s>=70 && s<=74){

printf("A-=3.50");
}
else if(s>=65&&s<=69){

    printf("B+=3.25");

}
else if(s>=60 && s<=64){

  printf("B=3.00");
}
else if(s>=55 && s<=59){

    printf("B-=2.75");
}
else if(s>=50 && s<=54){

     printf("c+=2.5");
 }
else if(s>=45&&s<=49){
    printf("c=2.25");
}
else if(s>=40&&s<=44){

    printf("D=2.0");
}
else{
    printf("Failed? ");
    printf("         000000        \n");
    printf("     ((^^^^^^^^^^))      \n ");
    printf("    (( ^^   ^^  ))     \n");
    printf("     ((  0    0  ))    \n");
    printf("     ((    00    ))    \n");
    printf("      (( <||||> ))     \n");
    printf("        ((____))       \n");



}
}

Example 3: Grading System Based on Marks

#include <stdio.h>

int main() {
    int marks;
printf("Enter your marks: ");
scanf("%d", &marks);

if (marks >= 90) {
    printf("Grade: A\n");
} else {
    if (marks >= 75) {
        printf("Grade: B\n");
    } else {
        if (marks >= 50) {
            printf("Grade: C\n");
        } else {
            printf("Grade: F\n");
        }
    }
}

return 0;}

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