We have to create a program that does post operator calculation with some inputs

We have to create a program that does post operator calculation with some inputs (numbers and operators).

Class Diagram:

Class post

Private: Char input, op, number Int num, result

Public: Void getdata() Void display() Void calc()

Solution:

#include <stdio.h> #include <conio.h> #include <stdlib.h> class post{ private:        char input[80];        int num, result;        char op[80],number[80]; public:        void getdata(){        printf("Enter your number and operator: ");        gets(input);        }        void display(){        printf("Result: %d",result);        }               void calc(){               num = atoi(input);               op[0]='\0';               result = 0;               int i,j,breaker=0;               j=0;               for (i=0; ; i++){                      number[i]=num%10;                      num=num/10;                      if (!num)                            break;                      }               for (i=0; i<strlen(input); i++){                      if (((input[i] == '+') || (input[i] == '-') || (input[i] == '*') || (input[i] == '/'))){                            op[j]=input[i];                            j++;                            if (!breaker)                                   continue;                            else if (i != (breaker+1))                                   break;                            breaker = i;                            }                      }               int k=0,temp=j-1;               for (i=j-1; i>=0; i--){                      if (op[i] == '+'){                            if (k==j)                                   break;                            if (k==0)                                   result = number[k+1]+number[k];                            else                                   result = number[k+1]+result;                      }                      else if (op[i] == '-'){                            if (k==j)                                   break;                            if (k==0)                                   result = number[k+1]-number[k];                             else                                   result = number[k+1]-result;                      }                      else if (op[i] == '*'){                            if (k==j)                                   break;                            if (k==0)                                   result = number[k+1]*number[k];                            else                                   result = number[k+1]*result;                      }                      else if (op[i] == '/'){                            if (k==j)                                   break;                            if (k==0)                                   result = number[k+1]/number[k];                            else                                   result = number[k+1]/result;                            }                      k++;                      }               }        }; void main(){        post test;        test.getdata();        test.calc();        test.display();        getch(); }

At first I used friend function, but icould not solve it. Then I used member function.  I solved the program successfully.