C语言 文件合并答:void main(void){ FILE *fA,*fB,*fC;char buf[256];long l1,l2;fA=fopen("A.txt","rb");fB=fopen("B.txt","rb");fC=fopen("C.txt","wb");fseek(fA,0,2);l1=ftell(fA);fseek(fA,0,0);fseek(fB,0,2);l2=ftell(fB);fseek(fB,0,0);fread(buf,l1,1,fA);fread(&buf...