How to stop scanf with less arguments-CodePudding

I need to keep getting 3 values (int, int, float) from the keyboard and only stop the loop when I enter 0.

The problem is that when I enter 0 and press [Enter it keeps waiting for the second and third value.

    int i, j; float v;
    while (scanf("%i %i %f", &i, &j, &v) == 3){
        Matrix* M = (Matrix*)malloc(sizeof(Matrix));
        M->line = i;
        M->column = j;
        M->info = v;
        printf("loop");
    }

I know that scanf returns an integer representing the number of successfully captured values, the question is: How to stop waiting for new inputs and return the number of already captured. (So i can exit the loop in this case.)

CodePudding user response：

I would consider just reading whole lines in the loop and then parsing that line using sscanf inside the loop. Return value 1 and the first value parsed as 0 would indicate your desired ending condition. When you had the complete line available, you could also present better error diagnostics.

CodePudding user response：

As suggested by others, would you please try:

    char line[BUFSIZ];

    while (fgets(line, BUFSIZ, stdin)) {
        if (strcmp(line, "0\n") == 0 || strcmp(line, "q\n") == 0)
            break;
        else {
            sscanf(line, "%i %i %f", &i, &j, &v);
            ...
        }
    }

Entering just 0 or q will exit the loop.