Problem: Scholarship Endowment Fund Part 2 (fund2.c) - c

Question

Problem: Scholarship Endowment Fund Part 2 (fund2.c)
How do I return back to main menu and add a counter for the total number of donations and investment made, here's what i got?
Then, your program should allow the user the following options:
Make a donation
Make an investment
Print balance of fund
Quit
#include <stdio.h>
#include <stdlib.h>
//main functions
int main() {
// variables
int donation, investment, fund, total, tdonations, tinvestments;
// prompt user
printf("Welcome!\n");
printf("What is the initial balance of the fund\n");
scanf("%d", &fund);
int ans;
printf("What would you like to do?\n");
printf("\t1- Make a Donation\n");
printf("\t2- Make an investment\n");
printf("\t3- Print balance of fund\n");
printf("\t4- Quit\n");
scanf("%d", &ans);
if (ans == 1) {
printf("How much would you like to donate?\n");
scanf("%d", &donation);
}
if (ans == 2) {
printf("How much would you like to invest?\n");
scanf("%d", &investment);
return main();
}
if (ans == 3) {
total = donation + fund - investment;
if (total < fund) {
printf("You cannot make an investment of that amount\n");
return main();
}
else {
printf("The current balance is %d\n", total);
printf(" There have been %d donations and %d investments.\n", tdonations, tinvestments);
}
}
if (ans == 4) {
printf("Type 4 to quit\n");
}
else {
printf("Not a valid option.\n");
}
//switch
switch (ans) {
case 1:
printf("How much would you like to donate?\n");
scanf("%d", &donation);
return main();
case 2:
printf("How much would you like to invest\n");
scanf("%d", &investment);
return main();
case 3:
printf("The current balance is %d\n", total);
printf(" There have been %d donations and %d investments.\n", tdonations, tinvestments);
return main();
case 4:
break;
}
return 0;
}

Answer 1

You should put in a loop the part that you want to be repeated, using a varaible to decide when to stop.
here is an example, also in the switch costruct you should usa a default option, maybe to warn the user that the option they inserted is not valid.
int main() {
// variables
int donation, investment, fund, total, tdonations, tinvestments;
// prompt user
printf("Welcome!\n");
printf("What is the initial balance of the fund\n");
scanf("%d", &fund);
//loop until the user decide so
int exit = 0;
while(exit == 0){
int ans;
printf("What would you like to do?\n");
printf("\t1- Make a Donation\n");
printf("\t2- Make an investment\n");
printf("\t3- Print balance of fund\n");
printf("\t4- Quit\n");
scanf("%d", &ans);
//switch
switch (ans) {
case 1:
printf("How much would you like to donate?\n");
scanf("%d", &donation);
break;
case 2:
printf("How much would you like to invest\n");
scanf("%d", &investment);
break;
case 3:
total = donation + fund - investment;
if (total < fund) {
printf("You cannot make an investment of that amount\n");
}
else {
printf("The current balance is %d\n", total);
printf(" There have been %d donations and %d investments.\n", tdonations, tinvestments);
}
break;
case 4:
exit = 1;
break;
default:
printf("Incorrect option\n");
break;
}
}
return 0;
}