[Solved] What does this statement means on a C program? ” While (scanf (“%d”, &t) ==1)” And why should I write the rest of the program in that while loop? [closed]

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“While” loop isn’t necessary. Your code works perfectly fine without while loop, if you write like this:

scanf("%d", &t);
for (i = 1; i <= t; i++)

If you want multiple “t” inputs you should move your return statement after while brace: 

int t, i;
float h, l, w;
while (scanf("%d", &t)) {

    for (i = 1; i <= t; i++)
    {
        scanf("%f%f%f", &l, &w, &h);
        if (l <= 20 && w <= 20 && h <= 20)
            printf("Case %d: good\n", i);
        else
            printf("Case %d: bad\n", i);
    }
}
return 0;

Also, checking if scanf returned 1 is some kind of protection. scanf returns number of elements filled (int this case 1). If you try to write non-digits it returns 0. You can check what your scanf returns with this or similar code:

printf("%d", scanf("%d", &t));

Good luck!

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solved What does this statement means on a C program? ” While (scanf (“%d”, &t) ==1)” And why should I write the rest of the program in that while loop? [closed]