题目内容

下面程序的功能是先从键盘输入一字符串，将小写字母转换成大写字母后输出到文件test.txt中，然后从该文件读出字符串并显示出来。请填空。#include intmain( ){FILE*fp;charstr[100];inti=0;if((fp=fopen("text.txt",___))==NULL){printf("can'topenthisfile.\n");exit(0);}printf("inputastring:\n");gets(str);while(str[i]){if(str[i]>='a'&&str[i]<='z')str[i]=_;fputc(str[i],fp);i++;}fclose(fp);fp=fopen("test.txt",_____);fgets(str,100,fp);printf("%s\n",str);fclose(fp);return0;}

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