Add troubleshoot system to help customers identify problems

src/interestCalculator.c

@@ -1,6 +1,22 @@
 #include "interestCalculator.h"
 
 
+void troubleshoot(int errorCode){
+    printf("Error! The requested operation was terminated because of an issue. Here are some details about the error:\n---------------\n");
+
+    switch(errorCode){
+        case 0:
+            printf("Principal amount not valid. Make sure it is a valid number over the value of zero.");
+            break;
+        case 1:
+            printf("Interest rate not valid. Make sure it is a valid number over the value of zero.");
+            break;
+        case 2:
+            printf("Duration not valid. Make sure it is a valid number over the value of zero.");
+            break;
+    }
+}
+
 void calculateYearlyInterest(){
     float principalAmount;
     float interestPerYear;
@@ -9,18 +25,21 @@ void calculateYearlyInterest(){
     printf("Please enter the principal amount:");
     scanf("%f",&principalAmount);
     if(principalAmount<=0){
+        troubleshoot(0);
         return;
     }
 
     printf("\nPlease enter interest per year (percentage):");
     scanf("%f",&interestPerYear);
     if(interestPerYear<=0){
+        troubleshoot(1);
         return;
     }
 
     printf("\nPlease enter interest time in years:");
     scanf("%f",&timeInYears);
     if(timeInYears<=0){
+        troubleshoot(2);
         return;
     }
 
@@ -37,18 +56,21 @@ void calculateMonthlyInterest(){
     printf("Please enter the principal amount:");
     scanf("%f",&principalAmount);
     if(principalAmount<=0){
+        troubleshoot(0);
         return;
     }
 
     printf("\nPlease enter interest per month (percentage):");
     scanf("%f",&interestPerMonth);
     if(interestPerMonth<=0){
+        troubleshoot(1);
         return;
     }
 
     printf("\nPlease enter interest time in months:");
     scanf("%f",&timeInMonths);
     if(timeInMonths<=0){
+        troubleshoot(2);
         return;
     }
 

src/interestCalculator.h

@@ -5,4 +5,5 @@
 
 void calculateYearlyInterest();
 void calculateMonthlyInterest();
+void troubleshoot(int errorCode);
 #endif