Instead of reading a number, read a string and count the digits:
#include <stdio.h>
int main() {
char buffer[10000];
int n;
printf("Enter an integer: ");
if (scanf("%9999s", buffer) == 1) {
for (n = 0; buffer[n] >= '0' && buffer[n] <= '9'; n++)
continue;
printf("Number of digits: %d
", n);
}
return 0;
}
You can also use the scanf()
scanset feature to perform the test in one step:
#include <stdio.h>
int main() {
char buffer[10000];
int n;
printf("Enter an integer: ");
if (scanf("%9999[0-9]%n", buffer, &n) == 1) {
printf("Number of digits: %d
", n);
}
return 0;
}
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