printf函数

#include<stdio.h>


int main()
{
char *str = "hello";
printf("|%s|\n", str);
printf("|%2s|\n", str);
printf("|%7s|\n", str);
printf("|%-7s|\n", str);
printf("|%8.2s|\n", str);
printf("|%2.8s|\n", str);


double d = 10.2;
printf("|%f|\n", d);
printf("|%10.2f|\n", d);
printf("|%-10.2f|\n", d);


int a = 10;
printf("|%d|\n", a);
printf("|%5d|\n", a);
printf("|%+5d|\n", a);
printf("|%-5d|\n", a);


fprintf(stdout, "%d\n", a);


char buffer[1024] = {0};
sprintf(buffer, "%d nihao %s", a, str);
printf("%s\n", buffer);
return 0;
}