Question

Here’s my innocent-looking program

int main(int argc, char* argv[])
{
    if(argc < 3)
    {
        printf("Sorry");
        return 0;
    }

    char key[]= "45WPbZNljDN6CUCUU6ga";
    FILE* inpFile = fopen(argv[1],"r");
    FILE* outFile = fopen(argv[2],"w");
    if(!inpFile || !outFile)
    {
        printf("oops");
        return 0;
    }

    enc(inpFile,outFile,key);
    fclose(inpFile);
    fclose(outFile);
}

enc() is defined elsewhere but it’s not a problem. When I try to compile using the VS2010 command prompt, everything goes berserk. However, when I remove the argument-check block, it compiles fine.

int main(int argc, char* argv[])
{
    char key[]= "45WPbZNljDN6CUCUU6ga";
    FILE* inpFile = fopen(argv[1],"r");
    FILE* outFile = fopen(argv[2],"w");
    if(!inpFile || !outFile)
    {
        printf("oops");
        return 0;
    }

    enc(inpFile,outFile,key);
    fclose(inpFile);
    fclose(outFile);
}

Any ideas?

Answer 1

If it is compiled as a C program (.c extension with VS2010), it is not valid to declare variables after executable statements. You would need to move the declarations (key, inpFile, and outFile) all up to the front of main (prior to the first if statement).