实践最简单的项目：WC

#include "stdio.h"
#include "string.h"
#include "stdlib.h"
int charcalculate=0;
int wordcalculate=0;
int linecalculate=0;
void calculate(char * file)
{
FILE * fp;
char a;
if((fp=fopen(file,"r"))==NULL)
{
printf("read file failed！\n");
exit(-1);
}
while(!feof(fp))
{
a=fgetc(fp);
if(a!=' '&&a!='\n'&&a!='\t'&&a!=','&&a!='.'&&a!='!'&&a!=';'&&a!='=')
charcalculate++;
if(a==' '||a=='\n'||a=='\t'||a==','||a=='.'||a=='!'||a=='='||a==';')
wordcalculate++;
if(a=='\n'||a=='\t')
linecalculate++;
}
linecalculate++;
charcalculate--;
fclose(fp);
}
int main(int argc, char* argv[])
{
FILE *fp;

calculate(argv[2]);
while(1)
{
if((fp=fopen(argv[2],"r"))==NULL)
{
printf("FileNull\n\n\n");
scanf("%s%s%s",argv[0],argv[1],argv[2]);
continue;
}
else if(!strcmp(argv[1],"-c"))
printf("File:%sCharNum:%d\n",argv[2],charcalculate);
else if(!strcmp(argv[1],"-w"))
printf("File:%sWordNum:%d\n",argv[2],wordcalculate);
else if(!strcmp(argv[1],"-l"))
printf("File:%sLineNum:%d\n",argv[2],linecalculate);
else if(!strcmp(argv[1],"exit"))
{
printf("Exit!\n");
break;
}
else
printf("NullPoint\n");
printf("\n\n");
scanf("%s%s%s",argv[0],argv[1],argv[2]);
}
return 0;

}