CODEWITHSUNDEEP
cfunction
Bilal Khan
Bilal Khan

Reputation: 27

How to fetch values from one function and transfer it to another?

The first function is able to make new account. I want to store that new_acc name and DOB and transfer it to another function. So when I call the name in second function, it should check that name, if present then give me access.

One function

int new_acc(FILE *fp, char *name, size_t namesize, char *dob, size_t dobsize){
    char data[8][51];
    int done = 0;
    int repeat = 0;

    while (!done) {
        if (repeat) {
            if (! allowmore())
                break;}
        repeat = 1;

        for (int i = 0; i < 8; i++) {
            printf("Enter your %s: ", listing[i]);
            if (scanf(" %50[^\n]", data[i]) != 1) {
                done = 1;
                break;}
        }
        if (!done) { fprintf(fp, "%s %s\n", data[0], data[1]); }
    }
    fclose(fp);
    return 0;
}

Another function

int list_view(char *name, char *dob){
    printf("For person details, please enter the person name: \n");
    FILE * fr = fopen("/home/bilal/Documents/file.txt","r");

    printf("Enter your Name: ");
    if (scanf("%50s", name) != 1){       // Giving access through this 
       perror("Error while reading!");    // code
       return 0;}

    char ch[100];
    int index = 0;
    for (int i=0; i<8; i++){

        if(fr != NULL){
            while((ch[index] = fgetc(fr)) != EOF){
               if(ch[index] == ' ') {
                   ch[index] = '\0';
                   printf("Here is your %s: %s\n",listing[i], ch);
                   index = 0;
                   i++;}
               else { index++; }
           }
           fclose(fr);
        }
        else{ printf("Unable to read file."); }
    }
  return 0;
}

Upvotes: 1

Views: 93

Answers (1)

m-atoms
m-atoms

Reputation: 61

You need to be mindful of the scope of your variables. As a refresher:

The scope of a variable is the part of the program within which the variable can be used. So, the scope describes the visibility of an identifier within the program.

The data variable is declared locally inside new_acc and not returned, which means that it is not visible outside the function.

To clarify this point, consider your listing array. You access it within both new_acc and list_view despite not passing it into either function. This leads me to believe that it is declared globally (outside any functions). If you want name to be visible in list_view you must similarly make it global or return it from new_acc.

note: the link I included also discusses lifetime of variables which is equally important to consider

Upvotes: 1

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