#include <stdio.h>
#include <math.h>
 
// Function to calculate Simple Interest
float simpleInterest(float p, float r, float t) {
    return (p * r * t) / 100;
}
 
// Function to calculate Compound Interest
float compoundInterest(float p, float r, float t) {
    float amount = p * pow((1 + r / 100), t);
    return amount - p;
}
 
// Function to print ASCII bar for visualization
void printBar(float value) {
    int length = (int)(value / 10); // scale down for console
    for (int i = 0; i < length; i++) {
        printf("#");
    }
}
 
int main() {
    float principal, rate, time;
    int choice, years, i;
 
    // Input values
    printf("Enter Principal amount: ");
    scanf("%f", &principal);
 
    printf("Enter Rate of Interest (in %%): ");
    scanf("%f", &rate);
 
    printf("Enter Time (in years): ");
    scanf("%f", &time);
 
    do {
        printf("\n===== Interest Menu =====\n");
        printf("1. Calculate Simple Interest\n");
        printf("2. Calculate Compound Interest\n");
        printf("3. Difference between SI and CI\n");
        printf("4. Year-wise Comparison Table\n");
        printf("5. Graphical Comparison (SI vs CI)\n");
        printf("0. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
 
        switch (choice) {
            case 1: {
                float si = simpleInterest(principal, rate, time);
                printf("\nSimple Interest = %.2f\n", si);
                break;
            }
            case 2: {
                float ci = compoundInterest(principal, rate, time);
                printf("\nCompound Interest = %.2f\n", ci);
                break;
            }
            case 3: {
                float si = simpleInterest(principal, rate, time);
                float ci = compoundInterest(principal, rate, time);
                printf("\nDifference (CI - SI) = %.2f\n", ci - si);
                break;
            }
            case 4: {
                years = (int)time;
                printf("\nYear | Simple Interest | Compound Interest\n");
                printf("------------------------------------------\n");
                for (i = 1; i <= years; i++) {
                    float si = simpleInterest(principal, rate, i);
                    float ci = compoundInterest(principal, rate, i);
                    printf("%4d | %.2f\t\t %.2f\n", i, si, ci);
                }
                break;
            }
            case 5: {
                years = (int)time;
                printf("\nYear | Simple Interest (Bar) | Compound Interest (Bar)\n");
                printf("---------------------------------------------------------\n");
                for (i = 1; i <= years; i++) {
                    float si = simpleInterest(principal, rate, i);
                    float ci = compoundInterest(principal, rate, i);
 
                    printf("%4d | ", i);
                    printBar(si);
                    printf(" (%.2f)", si);
 
                    printf("\t| ");
                    printBar(ci);
                    printf(" (%.2f)\n", ci);
                }
                break;
            }
            case 0:
                printf("\nExiting program. Thank you!\n");
                break;
 
            default:
                printf("\nInvalid choice! Please try again.\n");
        }
    } while (choice != 0);
 
    return 0;
}