没%d?
#include <stdio.h>
int main(){
int age = 18;
float height = 1.85;
char unit = 'm';
printf("小明今年%d岁\n", age);
printf("小明身高%f\%cn", height, unit);
printf("小明现在在慕课网上学习IT技术%s");
return 0;
}