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c语言怎么将数据写入文件
利用VC软件通过代码书写就可以将数据写入文件。
首先打开VC++6.0。
选择文件，新建。
选择C++ source file 新建一个空白文档。
先声明头文件#include stdio.h。
写上主函数
void main
主要代码
FILE *infile,*outfile,*otherfile;
char input;
char inputs[10];
int i=0;
infile = fopen("d:\\infile.txt","r+");//用fopen函数打开文件
outfile = fopen("d:\\outfile.txt","a+");//用fopen函数打开文件
if ( !infile )
printf("open infile failed....\n");
if ( !outfile)
printf("open outfile failed...\n");
printf("*********************************************\n");
printf("** This program is to show file operation! **\n");
printf("** The input file is: **\n");
printf("** d:\\infile.txt **\n");
printf("** The contents in this file is: **\n");
printf("\n");
for(;;)
{
input = fgetc(infile);//死循环读出文件内容
printf("%c",input);
putc(input,outfile);//写入内容
i++;
if(input == '\n' || input == EOF)
break;
}
fclose(infile);
fclose(outfile);
scanf("%d",i)
运行结果
C语言文件写入怎么操作？
C++的文本文件写入
// outfile.cpp -- writing to a file
#include iostream
#include fstream // for file I/O
int main()
{
using namespace std;
char automobile[50];
int year;
double a_price;
double d_price;
ofstream outFile; // create object for output
outFile.open("carinfo.txt"); // associate with a file
cout "Enter the make and model of automobile: ";
cin.getline(automobile, 50);
cout "Enter the model year: ";
cin year;
cout "Enter the original asking price: ";
cin a_price;
d_price = 0.913 * a_price;
// display information on screen with cout
cout fixed;
cout.precision(2);
cout.setf(ios_base::showpoint);
cout "Make and model: " automobile endl;
cout "Year: " year endl;
cout "Was asking $" a_price endl;
cout "Now asking $" d_price endl;
// now do exact same things using outFile instead of cout
outFile fixed;
outFile.precision(2);
outFile.setf(ios_base::showpoint);
outFile "Make and model: " automobile endl;
outFile "Year: " year endl;
outFile "Was asking $" a_price endl;
outFile "Now asking $" d_price endl;
outFile.close(); // done with file
return 0;
}
怎么用C语言在一个文件后面添加内容
怎么用C语言在一个文件后面添加内容
使用fopen函数打开文件，用fseek函数将文件位置调整到文件末尾，然后用fwrite函数写入数据即可。下面的示例代码，向1.txt的文件中追加hello world的字符串。
#include stdio.h
#include string.h
int main()
{
FILE *fp = fopen("1.txt", "a+");
if (fp==0) { printf("can't open file\n"); return 0;}
fseek(fp, 0, SEEK_END);
char sz_add[] = "hello world\n";
fwrite(sz_add, strlen(sz_add), 1, fp);
fclose(fp);
return 0;
}
