基础

VC++上机步骤

XT1_1

/*p2 1.1*/
#include <stdio.h>
#include <math.h>
main()
{
float a,b,c,l,area;
printf("Please input three numbers:");
scanf("%f%f%f",&a,&b,&c);
l=(a+b+c)/2.0;
area=sqrt(l*(l-a)*(l-b)*(l-c));
printf("area=%6.2f\n",area);
}
/* Please input three numbers:3.4 5.6 7.4
area= 9.05 */

XT1_2

/*p12 2.1*/
#include <stdio.h>
void main()
{
printf("123456789012345\n");
printf("ab c\tde\b\101fg\n");
printf("ab c\rde\12\x41\n");
}
/*123456789012345
ab c dAfg
de c
A*/