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  1.     // here is my code
  2.     #include <iostream>
  3.     #include <ctype.h>
  4.     #include <string.h>
  5.     #include <fstream>
  6.     #include <cstring>
  7.     #define MAX 15
  8.     using namespace std;
  9.     char fourdigOfnum(char *s1,char *s2) {
  10.         int i=0;
  11.         while(i<4)
  12.         {
  13.             s1[i]=s2[i];
  14.             ++i;
  15.         }
  16.         s1[i]='\0';
  17.     }
  18.     int main() {
  19.         char num_dig[4],simCard[MAX];
  20.         char mobile_num[MAX];
  21.         ofstream file;
  22.         file.open("mobile.txt",ios::out);
  23.         cout<<"Enter a Mobile-Number : "; cin>>mobile_num;
  24.         if(mobile_num[0]==0||strlen(mobile_num)==11)
  25.         {
  26.             //num_dig=fourdigOfnum(str_num);
  27.             fourdigOfnum(num_dig,mobile_num);
  28.             if(num_dig[strlen(num_dig-1)]==0)
  29.             {
  30.                 strncpy(simCard,"Jazz",sizeof(simCard));
  31.             }
  32.             else if(num_dig[strlen(num_dig-1)]==1)
  33.             {
  34.                 strncpy(simCard,"Zong",sizeof(simCard));
  35.             }
  36.             else if(num_dig[strlen(num_dig-1)]==2)
  37.             {
  38.                 strncpy(simCard,"Warid",sizeof(simCard));
  39.             }
  40.             else if(num_dig[strlen(num_dig-1)]==3)
  41.             {
  42.                 strncpy(simCard,"Ufone",sizeof(simCard));
  43.             }
  44.             else if(num_dig[strlen(num_dig-1)]==4)
  45.             {
  46.                 strncpy(simCard,"Telenor",sizeof(simCard));
  47.             }
  48.         } else {
  49.             cout<<"You entered a Invalid number "<<endl;
  50.         } 
  51.         if(file.fail())
  52.         {
  53.             cout<<"Sorry File is failed to open "<<endl;
  54.         } else {
  55.             file<<"Your Mobile-Number is "<<mobile_num<<endl;
  56.             file<<"This is a "<<simCard<<" number "<<endl;
  57.         }
  58.         file.close();
  59.         system("pause");
  60.         return 0;
  61.     }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp: In function 'int main()':
prog.cpp:59:23: error: 'system' was not declared in this scope
         system("pause");
                       ^
stdout
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Standard output is empty
https://ideone.com/Vc0043
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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