程序编译成功，但跑不了，什么问题？

Question

谁能跑一下这个程序，看看什么问题？

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void decrypt(const char *file);
int main(int argc,char *argv[])
{
    if(argc==2)
    {
    const char *encryptedfile=argv[1];
    decrypt(encryptedfile);
    return 0;
    printf("%d",argc);
    }
    else
    {
    printf("%s\n",argv[0]);
        printf("%d",argc);
        return 4;
    }
   
}
void decrypt(const char *file)
{
    int argc;
    FILE *encrypt=fopen(file,"rb");
    if(encrypt==NULL)
    {
        printf("fail to open\n"); 
        printf("%d",argc);
        return;
    }

    char decryptedFilename[100];
    strcpy(decryptedFilename, file);
    strcat(decryptedFilename, ".dec");

    
    FILE* decrypted = fopen(decryptedFilename, "wb");
    if (decrypted == NULL)
     {
        printf("Failed to create the decrypted file.\n");
        fclose(encrypt);
        return;
     }
     int ch;
     while((ch=fgetc(encrypt))!=EOF)
     {
         unsigned char decryptedByte= (ch<<3) | (ch>>5);
         decryptedByte^=0xF0;
         fputc(decryptedByte,decrypted);
     }
     fclose(encrypt);
     fclose(decrypted);
}

Answer 1

代码想实现什么功能？