Question

#include <stdio.h> void WriteStr(char *fn,char *str) {FILE *fp;

#include <stdio.h>
void WriteStr(char *fn,char *str)
{FILE *fp;
fp=fopen(fn,"w");
fputs(str,fp);
fclose(fp);
}
main()
{
WriteStr("t1.dat","start") ;
WriteStr("t1.dat","end") ;
}运行结果是不是startend,但是t1.txt中只有end对么？请大神指教

Answer 1

fopen(fn,"w"); 每次写入，如果原来有内容，会被覆盖

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Answer 2

用w 方式fopen文件会清除原文件的内容，用a试一下。