Thread: Help with C programming

Given an expression with three operands and two operators as input, evaluate the expression while following the rules of operator precedence.

Example Execution #1:
Enter the expression in the form [int char int char int]: 4 + 5 + 6
(4 + 5) + 6 = 15

These are the instructions for the code i'm supposed to me writing and this is the code I've managed to write:

Code:

#include <stdio.h>

int getInput (int *, char *, int *, char *, int *);
int logiCalc (int *, char *, int *, char *, int *);

int main ()

{
  //LOCAL DECLARATION

  int numA;  // FIRST INTEGER
  int numB;  // SECOND INTEGER
  int numC;  // THIRD INTEGER
  char opA;  // FIRST OPERAND
  char opB;  // SECOND OPERAND
  int input; // CALLING INPUT FUNCTION
  int result; //CALLING THE OPERAND FUNCTION


  // EXECUTABLE STATEMENTS

 input =  getIntput(&numA, &opA, &numB, &opB, &numC);
 result = logiCalc (&numA, &opA, &numB, &opB, &numC);

 return(0);

}

int getInput (int numA, char opA, int numB, char opB, int numC)

{
  printf("Enter the expression in the form [int char int char int]:");

  scanf("%d %c %d %c %d", &numA, &opA, &numB, &opB, &numC);

  return (0);
}

int logiCalc (int numA, char opA, int numB, char opB, int numC)

{
  switch (opA)
  {
    case '+': printf("%d + %d", numA, numB);
              break;

 case '-': printf("%d - %d", numA, numB);
              break;
    case '*': printf("(%d * %d", numA, numB);
              break;
    case '/': printf("(%d / %d", numA, numB);
              break;
    case '%': printf("(%d %% %d", numA, numB);
              break;
    default:  printf("Enter the correct operator\n");
  }

  switch (opB)
  {
    case '+': printf("+ %d)\n", numC);
              break;
    case '-': printf("- %d)\n", numC);
              break;
    case '*': printf("* %d)\n", numC);
              break;
    case '/': printf("/ %d)\n", numC);
              break;
    case '%': printf("%% %d)\n", numC);
              break;
    default:  printf("Enter the correct operator\n");
  }

  return(0);
}

I'd like some assistance as to how to proceed as i think there are a few problems with my logic. Also there is an error when i compile this code: conflicting types in the both the user defined functions.

It would be helpful to know what the error is about.

Your prototype functions' arguments are pointers, whereas in your actual functions, they are not. Thus there is a mismatch between your function prototypes & your actual function declarations.

Compare your functional declaration to your prototype:
int logiCalc (int numA, char opA, int numB, char opB, int numC)
int logiCalc (int *, char *, int *, char *, int *);

int x; //this is an integer, x
int *x; //this is a pointer to an integer x