Learning by doing: Reading books and trying to understand the (code) examples
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#include <stdio.h>
#include <string.h>
int main (void) {
char first_name[20];
printf("Your first name: ");
scanf("%s", first_name);
printf("Your name: \"%s\"\n", first_name);
printf("Your name: \"%20s\"\n", first_name);
printf("Your name: \"%*s\"\n", (int)(strlen(first_name)+3), first_name);
return 0;
}