Reading input (stdin)
Read what you type in the IDE's Input tab with scanf or fgets.
Runs in Zerethon IDE · C (GCC 14)
Official C documentation ↗
A run cannot ask questions while it runs: type the input in the Input tab before pressing Run.
main.c
#include <stdio.h>
#include <string.h>
int main(void) {
char name[64];
int a, b;
if (!fgets(name, sizeof name, stdin)) return 1;
name[strcspn(name, "\n")] = '\0'; /* drop the newline fgets keeps */
if (scanf("%d %d", &a, &b) != 2) return 1;
printf("Hello, %s! %d + %d = %d\n", name, a, b, a + b);
return 0;
}Input (stdin)
Ada 3 4
Output
Hello, Ada! 3 + 4 = 7
main.c
#include <stdio.h>
int main(void) {
int value, total = 0;
while (scanf("%d", &value) == 1) total += value;
printf("total: %d\n", total);
return 0;
}Input (stdin)
5 10 15
Output
total: 30
scanf returns how many values it read — loop until it stops returning 1.
Watch out: Always check what scanf returns: with missing input the variables keep garbage values.