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How to capture strings or char inputs using atoi/atof if your range is 0?

Discussion in 'C' started by askmewhy25, Mar 10, 2010.

  1. askmewhy25

    askmewhy25 New Member

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    How to capture strings or char inputs using atoi/atof if your range is 0
    becuse my programs continue if the input is a char or string due to that the
    string or char is read or equal to zero..

    Code:
    #include <stdio.h>
    #include <conio.h>
    #include <math.h>
    #include <stdlib.h>
    #include <string.h>
    
    int a(double sales,double sepcost)
    {
        double NRV;
        NRV=sales-sepcost; 
        printf("The Net Realizable Value is: %.3lf\n",NRV);
    
    }
    int main()
    {
        double sales,sepcost;
        char error[128];
      
        do{
          system("cls");
          printf("Please input your Sales Value: \n");
          scanf("%s",&error);
          sales=atof(error);
          printf("Please input your Separable Cost: \n");
          scanf("%s",&error);
          sepcost=atof(error);
          if(sales<0){
            system("cls");
            printf("Invalid input for Sales, Please try again!!\n");
            system("pause");
            }
          if(sepcost<0){
            system("cls");
            printf("Invalid input for Seperabe Cost, Please try again!!\n");
            system("pause");
            }
          }while(sales<0||sepcost<0);
          a(sales,sepcost);
    
    getch();
    }
    
    
    
    
     
  2. arunlalds

    arunlalds Banned

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  3. itstimetojazz

    itstimetojazz New Member

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    what characters or strings are given as input to the atof in the above program?
     
  4. virxen

    virxen New Member

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    in c++ you can do this

    Code:
    
    #include <iostream>
    #include <conio.h>
    
    int a(double sales,double sepcost){
        double NRV;
        NRV=sales-sepcost; 
        printf("The Net Realizable Value is: %.3lf\n",NRV);
    
    }
    int main()
    {
        double sales,sepcost;
        char error[128];
      
        do{
          system("cls");
          printf("Please input your Sales Value: \n");
                
          
          std::cin>>sales;
    
          if (std::cin.fail()){             
              std::cin.clear();
              std::cin.ignore(std::numeric_limits<int>::max(),'\n');
              sales=-1;
          }
                if(sales<0){
            system("cls");
            printf("Invalid input for Sales, Please try again!!\n");
            system("pause");
            }else{
          
          printf("Please input your Separable Cost: \n");
          std::cin>>sepcost;
          if (std::cin.fail()){             
              std::cin.clear();
              std::cin.ignore(std::numeric_limits<int>::max(),'\n');
              sepcost=-1;
          }
          
    
          if(sepcost<0){
            system("cls");
            printf("Invalid input for Seperabe Cost, Please try again!!\n");
            system("pause");
            }
        }
          }while(sales<0||sepcost<0);
          a(sales,sepcost);
    
    getch();
    }
    
     
    shabbir likes this.

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