I mean we have MAX_LENGTH value, so I want to cap the string formatting length using it but not a number like 12.
#include <stdio.h>
#define MAX_LENGTH 12
int main(void) {
char first_name[MAX_LENGTH + 1], last_name[MAX_LENGTH + 1];
printf("Пожалуйста, введите ваше имя: ");
scanf("%12s", first_name);
char ch; // Clearing the buffer to fix a bug when the input
while((ch = getchar()) != '\n' && ch != EOF); // string lenght is greater than MAX_LENGTH.
printf("Пожалуйста, введите фамилию: "); // So, I made it 12 just to show that in case of string length > 12
scanf("%12s", last_name); // the program doesn't crash but just cuts the string.
printf("Ваши данные: %s %s\n", last_name, first_name);
return 0;
}
I'd wanted to do something like
printf("%.*s", MAX_LENGTH, string);
but with the scanf function. Just to not be fixing it every time I change MAX_LENGTH.
You can use any string as a format of the scanf. It can be also a variable.
#include <stdio.h>
int main(void)
{
char format[16];
char string[16];
size_t maxLength;
if(scanf("%zu", &maxLength) != 1) { /* handle error */}
sprintf(format, "%%%zus", maxLength);
if(scanf(format, string) != 1) { /* handle error */}
printf("`%s`\n", string);
}
Result:
`12345`