1 #include <stdio.h> 2 main(int argc,char * argv[])3 int main(int argc, char *argv[]) 4 { 5 int x; 6 7 printf("Hello %s, write a number!\n", argv[1]); 8 printf("x = "); 9 scanf("%d", &x); 10 printf("x * x = %d\n", x * x); 11 return 0; 12 } 13