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  1. #include <stdio.h>
  2.  
  3. void buildingFootprint(void) {
  4.     double electricityKWh;
  5.     printf("\n[Building] Enter monthly electricity consumption (kWh): ");
  6.     scanf("%lf", &electricityKWh);
  7.     printf("Building Annual Carbon Footprint: %.2f kg CO2\n", electricityKWh * 12 * 0.4);
  8. }
  9.  
  10. void carFootprint(void) {
  11.     double miles;
  12.     printf("\n[Car] Enter annual miles driven: ");
  13.     scanf("%lf", &miles);
  14.     printf("Car Annual Carbon Footprint: %.2f kg CO2\n", miles * 0.404);
  15. }
  16.  
  17. void bicycleFootprint(void) {
  18.     puts("\n[Bicycle] Direct operational emissions: 0.00 kg CO2 (Eco-friendly).");
  19. }
  20.  
  21. int main(void) {
  22.     void (*footprintCalculators[3])(void) = {buildingFootprint, carFootprint, bicycleFootprint};
  23.     int choice;
  24.  
  25.     printf("Calculate Carbon Footprint for:\n"
  26.            "0: Building\n1: Car\n2: Bicycle\nEnter choice: ");
  27.     scanf("%d", &choice);
  28.  
  29.     if (choice >= 0 && choice <= 2) {
  30.         (*footprintCalculators[choice])();
  31.     } else {
  32.         puts("Invalid selection.");
  33.     }
  34.     return 0;
  35. }
Success #stdin #stdout 0.01s 5312KB
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stdin
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Standard input is empty
stdout
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Calculate Carbon Footprint for:
0: Building
1: Car
2: Bicycle
Enter choice: 
[Building] Enter monthly electricity consumption (kWh): Building Annual Carbon Footprint: 0.00 kg CO2
https://ideone.com/ZL0PuV
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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