怎么给主函数传递参数?
#include<stdio.h>main(int argc,char *argv[]){FILE *fp;if(argc!=2){ printf("usage:canopen filename"); getchar(); return 2;}if((fp=fopen(argv[1],"r"))==NULL){ printf("%s can't be opened\n",argv[1]); getchar(); return 1;}printf("%s can be opened\n",argv[1]); fclose(fp); getchar(); return 0;}