C程序的注释只能是一行吗？

int open( const char *name, int mode, … /* int permissions */ );

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
intmain()
{
intm,k=1,n;
charline1[256],line[256];//将文件中的数据读入到字符数组中
FILE*fpin=fopen("sourcefile.c","r");
if(fpin==NULL)
{
printf("sourcecodereaderror!\n");
exit(1);
}
FILE*fpout=fopen("targetfile.c","w+");
if(fpout==NULL)
{
printf("sourcecodewriteerror!\n");
exit(1);
}
printf("请输入m和n：");
scanf("%d%d",&m,&n);
intn1=0;
fgets(line1,255,fpin);
do
{
n1++;
if(n1>=m&&n1<m+k)
fputs("//",fpout);
fputs(line1,fpout);
fgets(line1,255,fpin);
}
while(!feof(fpin));
fseek(fpout,0,SEEK_SET);
fgets(line,255,fpout);
do
{
printf("%d\t%s",k,line);
k++;
fgets(line,255,fpout);
}
while(!feof(fpout));
fclose(fpout);
fclose(fpin);
return0;