如何同时输出到控制台和文本文件，使他们是相同的 [英] How to output simultaneously onto console and a text file such that they are identical

问题描述

以下内容创建并打印一个随机数字表到控制台上。我如何修改我所做的createtxt函数，以便控制台上的输出同时生成一个文本文件。

  #include< stdio.h> 
 #include< stdlib.h> 
 #include< time.h> 
 
 
 FILE * createtxt（char * fnam）{
 FILE * ofp; 
 ofp = fopen（fnam，w）; 
 if（ofp == NULL）{
 printf（无法打开输出文件％s \ n，fnam）; 
 exit（EXIT_FAILURE）; 
 
 
 void closetxt（FILE * ofp）{
 fclose（ofp）; 
 
 
 int main（void）{
 printf（用于绘制不同颜色，大小和不透明度的几何图形的随机数表）; 
 
 int rn = 0; 
 unsigned int seed =（unsigned int）time（NULL）; 
 srand（seed）; 
 
 int k = 0; 
 printf（shape＃\ tRSCE \ tx \\\\\\\\\\\\\\'）; （k  printf（％6d，k）; 
。 
 rn = rand（）％SHAPE_RANGE; 
 printf（\t％4d，rn）; 
 rn = rand（）％X_RANGE; 
 printf（\t％d，rn）; 
 rn = rand（）％Y_RANGE; 
 printf（\t％d，rn）; 
 rn = rand（）％WIDTH_RANGE; 
 printf（\t％5d，rn）; 
 rn = rand（）％HEIGHT_RANGE; 
 printf（\t％6d，rn）; 
 rn = rand（）％RED_RANGE; 
 printf（\t％3d，rn）; 
 rn = rand（）％GREEN_RANGE; 
 printf（\t％5d，rn）; 
 rn = rand（）％BLUE_RANGE; 
 printf（\t％4d，rn）; 
 rn = rand（）％OPACITY_RANGE; 
 printf（\t％.1f\\\
，rn / 100.0）; 
 k ++; 
 
 
 FILE * ofp = createtxt（myrandom.txt）
 closetxt（ofp）; 
 
 return EXIT_SUCCESS; 
 
  

解决方案

使用printf（）语句执行：（参见下面的 createtxt（）

在printf语句之前打开文件：

pre $ FILE * ofp = createtxt（myrandom.txt）;
char buf [20];


rn = rand（）％SHAPE_RANGE;
sprintf（buf，\t％4d，rn）; //使用sprintf（）将信息放入buf
printf（buf）; //输出到stdout
fputs（buf，ofp）; //输出到文件
///为X_RANGE，Y_RANGE等重复行

fclose（ofp）;

如果来自于createtxt：

将原型更改为 int createtxt（char * fnam，char * buf） p>

而不是使用

  sprintf（buf，\t％4d ，rn）; //使用sprintf（）把信息放入buf 
 printf（buf）; //输出到stdout 
  

使用：

//创建并初始化一个更大的缓冲区。

  char buf [1000]; //或其他适当大小的缓冲区
 
 buf [0] = 0; //将NULL设置为buf 
的第一个位置//然后，在main的所有printf语句之间调用：
 sprintf（buf，％s\t％4d，buf，rn）; //将连接所有bufs直到结束
  

然后将buf作为参数传递给 createtxt （）。

  void createtxt（char * fnam，char * buf）
 { 
 FILE * ofp; 
 ofp = fopen（fnam，w）; 
 if（ofp == NULL）{
 printf（无法打开输出文件％s \ 
 exit（EXIT_FAILURE）; 
 {
 fputs（buf，ofp）; 
 fclose（ofp）; 
} 
  

The following creates and prints a table of random numbers onto the console. How can I modify the createtxt function I made, so that the output on the console is generated into a text file at the same time.

#include <stdio.h>
#include <stdlib.h>
#include <time.h>


FILE* createtxt(char* fnam){
    FILE* ofp;
    ofp = fopen(fnam, "w");
    if (ofp == NULL) {
        printf("Cannot open output file %s\n", fnam);
        exit(EXIT_FAILURE);
}

void closetxt(FILE* ofp){
    fclose(ofp);
}

int main (void){
    printf("Table of random numbers for drawing geometric shapes in different     colours, sizes and opacities\n");

int rn = 0;
unsigned int seed = (unsigned int)time(NULL);
srand(seed);

int k = 0;
printf("shape#\tRSCE\tx\ty\twidth\theight\tred\tgreen\tblue\tgreen\topacity\n");
while (k < NO_SHAPES){
    printf("%6d", k);
    rn = rand() % SHAPE_RANGE;
    printf( "\t%4d",rn);
    rn = rand() % X_RANGE;
    printf("\t%d",rn);
    rn = rand() % Y_RANGE;
    printf("\t%d",rn);
    rn = rand() % WIDTH_RANGE;
    printf("\t%5d",rn);
    rn = rand() % HEIGHT_RANGE;
    printf("\t%6d",rn);
    rn = rand() % RED_RANGE;
    printf("\t%3d",rn);
    rn = rand() % GREEN_RANGE;
    printf("\t%5d",rn);
    rn = rand() % BLUE_RANGE;
    printf("\t%4d",rn);
    rn = rand() % OPACITY_RANGE;
    printf("\t%.1f\n",rn/100.0);
    k++;
    }

    FILE* ofp = createtxt("myrandom.txt")
    closetxt(ofp);

    return EXIT_SUCCESS;
}

解决方案

This version is Done in-line with the printf() statements: (see below for in createtxt()
open the file before the printf statements:

FILE* ofp = createtxt("myrandom.txt");
char buf[20];


rn = rand() % SHAPE_RANGE;
sprintf(buf, "\t%4d",rn);//use sprintf() to put information into buf
printf(buf);             //output to stdout
fputs(buf, ofp );        //output to file
/// repeat lines for X_RANGE, Y_RANGE, etc.

fclose(ofp);     

If from within createtxt:

Change the prototype to int createtxt(char *fnam, char *buf)

rather than using

sprintf(buf, "\t%4d",rn);//use sprintf() to put information into buf
printf(buf);             //output to stdout  

Use:
//create and initialize a bigger buffer.

char buf[1000];  //or some other appropriately sized buffer

buf[0]=0;  //set NULL to first position of buf
//then, between all the printf statements in main, call this:      
sprintf(buf, %s\t%4d", buf, rn);//will concatenate all bufs until end  

Then pass buf as argument to createtxt().

void createtxt(char* fnam, char *buf)
{
    FILE* ofp;
    ofp = fopen(fnam, "w");
    if (ofp == NULL) {
        printf("Cannot open output file %s\n", fnam);
        exit(EXIT_FAILURE);
    {
    fputs(buf, ofp);
    fclose(ofp);
}

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