C语言主函数参数的调用

[jinlong2015]

[code=c]

[/code]#include<stdio.h>
void main(int argc,char *argv[])
{
float area,w,h;
if (argc < 3)
{
printf("\007Usage:%s width height\n",argv[0]);
printf("for example:%s 12.3 4.5\n",argv[0]);
return ;
}
// 参数0 是程序名,argc参数个数
scanf(argv[1],"%f ",&w); // 从参数1取得宽
scanf(argv[2],"%f",&h); // 从参数2取得高
printf("w=%f , h=%f ",w,h);
area = w * h;
printf("area=%f\n",area);
return ;
}
执行时，用命令lizi.exe 12.3 4.5
为什么w和h的值不等于预想的值？菜鸟求帮忙！

[breakfisher]

#include<stdio.h> #include <stdlib.h> void main(int argc,char *argv[]) { float area,w,h; if (argc < 3) { printf("\007Usage:%s width height\n",argv[0]); printf("for example:%s 12.3 4.5\n",argv[0]); return ; } w = atof(argv[1]); h = atof(argv[2]); printf("w=%f , h=%f ",w,h); area = w * h; printf("area=%f\n",area); return ; }

[Kuovane]

改成这样

#include<stdio.h>
void main(int argc,char *argv[])
{
	float area,w,h;
	if (argc < 3)
	{
		printf("\007Usage:%s width height\n",argv[0]);
		printf("for example:%s 12.3 4.5\n",argv[0]);
		return ;
	}
	// 参数0 是程序名,argc参数个数
	sscanf(argv[1],"%f ",&w); // 从参数1取得宽
	sscanf(argv[2],"%f",&h); // 从参数2取得高
	printf("w=%f , h=%f  ",w,h);
	area = w * h;
	printf("area=%f\n",area);
	return ;
}

[breakfisher]

还有好好看看scanf的用法

[jinlong2015]

多谢多谢！