C语言经典100例

C语言经典100例 非常受用哦 题目:有两个磁盘文件A和B,各存放一行字母,要求把这两个文件中的信息合并(按字母顺序排列), 输出到一个新文件C中. 1.程序分析: 2.程序源代码: #include "stdio.h" main() { FILE *fp; int i,j,n,ni; char c[160],t,ch; if((fp=fopen&#40;"A","r"&#41;)==NULL) {printf("file A cannot be opened\n"); exit(0);} printf("\n A contents are :\n"); for(i=0;(ch=fgetc(fp))!=EOF;i++) {c[i]=ch; putchar(c[i]); } fclose(fp); ni=i; if((fp=fopen&#40;"B","r"&#41;)==NULL) {printf("file B cannot be opened\n"); exit(0);} printf("\n B contents are :\n"); for(i=0;(ch=fgetc(fp))!=EOF;i++) {c[i]=ch; putchar(c[i]); } fclose(fp); n=i; for(i=0;i<n;i++) for(j=i+1;j<n;j++) if(c[i]>c[j]) {t=c[i];c[i]=c[j];c[j]=t;} printf("\n C file is:\n"); fp=fopen&#40;"C","w"&#41;; for(i=0;i<n;i++) { putc(c[i],fp); putchar(c[i]); } fclose(fp); }