#include <stdio.h>
#include <string.h>
int main() {
char str1[20]="1234567890";
char str2[20];
char str3[5];
strcpy(str2, str1);
puts(str2);
strncpy(str3, str1, sizeof(str3));
puts(str3);
strncpy(str3, str1, sizeof(str3)-1);
str3[sizeof(str3)-1]=0;
puts(str3);
return 0;
}
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