c语言经典算法100例.rar

				#include "stdio.h"
				main()
				{FILE *fp;
				char str[100],filename[10];
				int i=0;
				if((fp=fopen("test","w"))==NULL)
				{ printf("cannot open the file\n");
				exit(0);}
				printf("please input a string:\n");
				gets(str);
				while(str[i]!='!')
				{ if(str[i]>='a'&&str[i]				str[i]=str[i]-32;
				fputc(str[i],fp);
				i++;}
				fclose(fp);
				fp=fopen("test","r");
				fgets(str,strlen(str)+1,fp);
				printf("%s\n",str);
				fclose(fp);
				}