CODEWITHSUNDEEP
carraysstringloopsfgets
Itamar
Itamar

Reputation: 1

Stopping user input using the enter key in C

I'm trying to write a program that receives strings using fgets, but for some reason I can't get it to go past the user input stage. The input should stop once the user enters a "blank line", ie. the Enter key (\n) but even when this key is pressed the loop continues.

Here's the problematic part of my code:

char array[100][256];
for (int i = 0; array[i] != '\n'; i++)
{
    fgets(array[i], 256, stdin);
}

100 and 256 represent the maximum amount of lines and chars expected respectively.

Does anyone know where I went wrong?

Upvotes: 0

Views: 593

Answers (1)

hyde
hyde

Reputation: 62797

Here is your code fixed with minimal changes, explanations in comments. Note that this is not a very good way to solve your problem, long lines for example may not behave as you want (they will get split at several array lines).

char array[100][256];
memset(array, 0, sizeof array); // initialize the memory
int i = 0;
while(i<100) // avoid overflow of lines, also while may be clearer than for loop
{
    if(!fgets(array[i], 256, stdin)) break; // detect read failure
    if(array[i][0] == '\n') break; // got empty line
    // Note [0] above to test first char of line i
    ++i;
}
if (i==100) { /* too many lines */ }
else if (array[i][0] == 0) { /* read failure */  }
else {  /* indexes 0...i-1 contain data, index i contains empty line */ }

Upvotes: 1

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