program that reads numbers from scanf (keyboard) and then sums them, stopping when 0 has been entered. Construct three versions of this program, using the while, do-while, and for loops.

I'm going to write three examples in C language:

int main () {

int n, i, sum = 0;

printf ("Enter the number: ");

scanf ("%d", &n);

for (i = 1; i < = n; + +i) {

sum + = i;

}

printf ("Sum = %d", sum);

return 0;

}

int main () {

int n, i, sum = 0;

printf ("Enter a number: ");

scanf ("%d", &n);

i = 1;

while (i < = n) {

sum + = i;

++i;

}

printf ("Sum = %d", sum);

return 0;

}

int main () {

int n, i, sum = 0;

do {

printf ("Enter a number: ");

scanf ("%d", &n);

} while (n < = 0);

for (i = 1; i < = n; + +i) {

sum + = i;

}

printf ("Sum = %d", sum);

return 0;

}