使用C语言编写一个程序,将一个文件添加到另一个文件中去。答:int main(){ char s[300]="copy ",f1[100],f2[100],f3[100];printf("File1 name:");scanf("%s",f1);printf("File2 name:");scanf("%s",f2);printf("Dest File name:");scanf("%s",f3);strcat(s,f1);strcat(s,"/b+");strcat(s,f2);strcat(s,"/b ");strcat(s,f3);...