if( argc == 2 && (img = cvLoadImage( argv[1],1)) = 0 argc==2有什么含义?(img = cvLoadImage( argv[1],1)) = 0又有什么含义?

if (argc == 1) if(argc!=4) 有什么用 if(argc!=2)这句话怎么解释啊我想知道的是int main(int argc,char *argv[]) 函数中出现了if(argc!=2),我该如何理解呢. 用opencv 进行hough 变换,怎样得到并输出直线的角度?程序如下：#include cv.h#include highgui.h#include int main(int argc,char** argv){IplImage* src;//if( argc == 2 && (src=cvLoadImage(argv[1],0))!= 0)if(src=cvLoadImage(argc > ar if( argc == 2 && (img = cvLoadImage( argv[1],1)) = 0 argc==2有什么含义?(img = cvLoadImage( argv[1],1)) = 0又有什么含义? for (i = 1; i < argc; i++) for (i = 1; i < argc; i++){if (strcmp(argv[i],-h) == 0){usage();}}【注】：argc是主函数中的.strcmp和argv[i]也请解释 【急】 if (argc == 1) 到底有什么作用?main()函数开头就有这样一句话,(argc == 1)究竟有何作用?if (argc == 1){fprintf(stderr,las2las.exe is better run in the command line );} #include #include #define MAXLINE 1000int getline(char *line,int max);/* find:print lines that match pattern from 1st arg */main(int argc,char *argv[]){char line[MAXLINE];int found = 0;if (argc = 2)printf(Usage:find pattern );elsewhile (getline(li #include #include #include #include #pragma comment (lib,ws2_32.lib) int main (int argc,char *argv[]) { int iportFrom,iportTo; int testsocket; int iopenedport = 0; struct sockaddr_in target_addr; WSADATA wsaData; WORD wVersi(1,1); if (argc 【急】帮忙看下下面的代码是什么意思（从注释处开始解释）int alloced_file_name_in = 32; char** file_names_in = (char**)malloc(sizeof(char*)*alloced_file_name_in); if (argc == 1) { num_file_name_in = 2; fprintf(stderr, OpenCV中这句话if( argc == 3 && (pImg = cvLoadImage( argv[1], 0)) != 0 )什么意思啊?if( argc == 3 && (pImg = cvLoadImage( argv[1], 0)) != 0 )谁能解释一下上面的这句话的意思啊?关于OpenCV的 使用递归算法求Fibonacci数列的第n项,第一项是1,第二项是1,第n项是前两项之和#include stdafx.h#include int F(int n){if(n=0) return 1;else if(n=1) return 1;else return (F(n-1)+F(n-2));}int main(int argc,char* argv[]){int n;sca C语言 一个数包含的所有质数int main(int argc,char* argv[]){ int n,i,j,f,a[N],m,leap;leap=1;f=0;printf(please input a even );scanf(%d,&n);if (n%2!=0){printf(error);}for(i=2;i 问这个求解一元二次方程的程序哪里错了（急,#include #include #include int main(int argc,char *argv[]){double a,b,c,d,e,f;d=pow(b,2)-4*a*c;printf(Please input your a,b, );scanf(%lf,%lf,%lf,&a,&b,&c);if(a==0)printf(Error!The a c )(cos(rads)*radius);tmp1[0]=tmp1[1]=tmp1[2]=tmp1[3]=*(have i);argc==2 证明Ker(A)=Ker(A^2)当且仅当Im(A)=Im(A^2) C语言编一元二次方程出了点问题,int main(int argc,char *argv[]){int a,b,c,x1,x2;printf(Please input:a,b,c );scanf(%f%f%f,&a,&b,&c);x1=b*b-4*a*c;if(x10){ x2=(-b+sqrt(x1))/(2*a);x1=(-b+sqrt(x1))/(2*a);printf(x1=%f x2=%f,x1,x2); } el c语言编程问题 指针的用法 初学勿喷 下面是三个数比大小 #include int main(int argc,char *argv[]){int a,b,c,t;int * pa,* pb,* pc;scanf(%d %d %d,&a,&b,&c);* pa=&a;* pb=&b;* pc=&c;if(* pa>* pb){t=* pa;* pa=* pb;* pb=t;} if(* pa>*