C++ 程序：将文本文件中的小写字母转换为大写字母

#include using namespace std; int main() { FILE *fp1,*fp2; char ch; if ((fp1=fopen("s1.txt","r"))==NULL) { cout<<"can not open s1.txt\n"; return 0; } if ((fp2=fopen("d1.txt","w"))==NULL) { cout<<"can not open d1.txt\n"; return 0; } ch=fgetc(fp1); while(ch!=EOF) //修改点1：判断读入的字符是否为文件结束符 { if((ch>='a')&&(ch<='z')) { ch=ch-32; } fputc(ch, fp2); //修改点2：将修改后的字符写入到目标文件中 ch=fgetc(fp1); } fclose(fp1); fclose(fp2); return 0; }