4-3

#include<stdio.h>
#include<string.h>
int main(void)
{
float data;
printf("please input a data:\n");
scanf("%f",&data);
//printf("a. %2.1f\n",data);
//printf("a. %2.1e\n",data);
printf("b. %+5.3f\n",data);
printf("b. %5.3e\n",data);
return 0;
}