C++文件输入输出(免控制台输入)模板

#include<cstdio>
#include<algorithm>
#include<string.h>
#include<iostream>
using namespace std;
int dp[1005][1005]={0};
int main(){
    FILE *input=fopen("./data.txt","r");
    FILE *output=fopen("./result.txt","w");
    if(!input){printf("error opening input.\n");return 0;}
    if(!output){printf("error opening output.\n"};return 0;)}
    
    
    int n;
    fscanf(input,"%d",&n);
    fprintf(output,"%d",n*2);
    
    
    fclose(input);
    fclose(output);
    return 0;
}

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转载自blog.csdn.net/ur_ytii/article/details/112565855