Example: Student Grading System with Nested If-Else in C

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// Student Grading System with Nested If-Else
#include <stdio.h>

int main() {
    int score;

    // Step 1: Prompt user for input
    printf("Enter student's score (0-100): ");

    // Step 2: Read the score from user
    scanf("%d", &score);

    // Step 3: Outer if-else for score validation
    if (score >= 0 && score <= 100) {
        // Step 4: Inner if-else if ladder for grade assignment
        if (score >= 90) {
            printf("Grade: A\n");
        } else if (score >= 80) {
            printf("Grade: B\n");
        } else if (score >= 70) {
            printf("Grade: C\n");
        } else if (score >= 60) {
            printf("Grade: D\n");
        } else {
            printf("Grade: F\n");
        }
    } else {
        // Step 5: Handle invalid score
        printf("Invalid score entered. Score must be between 0 and 100.\n");
    }

    return 0;
}