Menu-driven structure program using functions Dry Run in C

Menu-driven structure program using functions is an interactive C dry run visualizer from the Struct Functions Pointers programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

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Menu-driven structure program using functions Program Code

#include <stdio.h>
#include <string.h>

struct Student {
    int roll;
    char name[50];
    float marks;
};

void addStudent(struct Student students[], int *count) {
    printf("\n--- Add Student ---\n");
    printf("Enter Roll No: ");
    scanf("%d", &students[*count].roll);
    printf("Enter Name: ");
    scanf(" %[^\n]", students[*count].name);
    printf("Enter Marks: ");
    scanf("%f", &students[*count].marks);
    (*count)++;
    printf("Student added successfully!\n");
}

void displayAll(struct Student students[], int count) {
    if(count == 0) {
        printf("\nNo students to display!\n");
        return;
    }
    printf("\n--- All Students ---\n");
    printf("%-10s %-20s %-10s\n", "Roll", "Name", "Marks");
    printf("----------------------------------------\n");
    for(int i = 0; i < count; i++) {
        printf("%-10d %-20s %-10.2f\n", 
               students[i].roll, students[i].name, students[i].marks);
    }
}

void searchStudent(struct Student students[], int count) {
    if(count == 0) {
        printf("\nNo students to search!\n");
        return;
    }
    int roll, found = 0;
    printf("\n--- Search Student ---\n");
    printf("Enter Roll No: ");
    scanf("%d", &roll);
    
    for(int i = 0; i < count; i++) {
        if(students[i].roll == roll) {
            printf("\nStudent Found:\n");
            printf("Roll: %d\n", students[i].roll);
            printf("Name: %s\n", students[i].name);
            printf("Marks: %.2f\n", students[i].marks);
            found = 1;
            break;
        }
    }
    if(!found) printf("Student not found!\n");
}

void updateStudent(struct Student students[], int count) {
    if(count == 0) {
        printf("\nNo students to update!\n");
        return;
    }
    int roll, found = 0;
    printf("\n--- Update Student ---\n");
    printf("Enter Roll No: ");
    scanf("%d", &roll);
    
    for(int i = 0; i < count; i++) {
        if(students[i].roll == roll) {
            printf("Enter New Name: ");
            scanf(" %[^\n]", students[i].name);
            printf("Enter New Marks: ");
            scanf("%f", &students[i].marks);
            printf("Student updated successfully!\n");
            found = 1;
            break;
        }
    }
    if(!found) printf("Student not found!\n");
}

int main() {
    struct Student students[100];
    int count = 0;
    int choice;
    
    do {
        printf("\n========== STUDENT MANAGEMENT SYSTEM ==========\n");
        printf("1. Add Student\n");
        printf("2. Display All Students\n");
        printf("3. Search Student\n");
        printf("4. Update Student\n");
        printf("5. Exit\n");
        printf("===============================================\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        
        switch(choice) {
            case 1: addStudent(students, &count); break;
            case 2: displayAll(students, count); break;
            case 3: searchStudent(students, count); break;
            case 4: updateStudent(students, count); break;
            case 5: printf("Exiting... Thank you!\n"); break;
            default: printf("Invalid choice! Try again.\n");
        }
    } while(choice != 5);
    
    return 0;
}

View the complete Struct Functions Pointers programs page.