输入字符的分类和Byte类型数字的比较

最新推荐文章于 2024-06-03 10:37:56 发布

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本文介绍了一个用于在C/C++中实现字符比较的函数及一个简单的字符输入统计程序。字符比较函数通过查找指定的字节序列来判断其是否存在于目标字符串中，并返回首次出现的位置。此外，还提供了一个统计程序，用于统计用户输入中的字母、数字、空白字符及其他字符的数量。

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#include <stdio.h>
#include <string.h>
#include <windows.h>
BOOL charcmp(byte by[],int len,char ch[],int lensc,int &num)
{
bool rtn = FALSE;
int n = 0;
bool isfirst = TRUE;
int j = 0;
if ((len != 0)&&(len < lensc))
{
for (int i = 0; i<= lensc-len;i++)
{
for(j = 0;j<len;j++)
{
if ( ch[i+j] !=(char)by[j])
{
rtn = FALSE;
isfirst = true;
n = 0;
num = -1;
break;
}
else
{
rtn = TRUE;
if (isfirst)
{
n = i;
num = i;
isfirst = FALSE;
}
}
}
if (len <= j)
{
return rtn;
}
}
}
else
{
rtn = FALSE;
}
return rtn;
}
void main()
{
char ch[500];
memset(ch,0,500);
byte by[8] = {0};
by[0] = 0X01;
by[1] = 0x04;
by[2] = 0x00;
by[3] = 0x00;
by[4] = 0x00;
by[5] = 0x08;
by[6] = 0xF1;
by[7] = 0xCC;
byte by1[8] = {0};
by1[0] = 0X0A;
by1[1] = 0x04;
by1[2] = 0x00;
by1[3] = 0x02;
by1[4] = 0x00;
by1[5] = 0x08;
by1[6] = 0x51;
by1[7] = 0x77;
byte by2[8] = {0};
by2[0] = 0X03;
by2[1] = 0x04;
by2[2] = 0x01;
by2[3] = 0x00;
by2[4] = 0x00;
by2[5] = 0x10;
by2[6] = 0xF1;
by2[7] = 0xD8;
byte by3[2] = {0};
by2[0] = 0X11;
by2[1] = 0x04;
memcpy(ch,by,8);
memcpy(ch+8,by1,8);
memcpy(ch+16,by2,8);
int num = -1;
bool flg = charcmp(by,8,ch,24,num);
if (flg)
{
int l = num;
printf("%d\n",num);
}
flg = charcmp(by1,8,ch,24,num);
if (flg)
{
int m = num;
printf("%d\n",num);
}
flg = charcmp(by2,8,ch,24,num);
if (flg)
{
int n = num;
printf("%d\n",num);
}
flg = charcmp(by3,8,ch,24,num);
if (flg)
{
int p = num;
printf("%d\n",num);
}
}

#include<iostream>

using namespace std;

int main()
{
int state = 0;
int nch = 0,nspace = 0,nother = 0,ndigit = 0;
int ch;
while((ch = getchar()) != EOF && ch != '\n')
{
if(isalpha(ch))
nch++;
else if(isdigit(ch))
ndigit++;
else if(isspace(ch))
nspace++;
else
nother++;

}
cout << "数字: " << ndigit << endl;
cout << "空格: " << nspace << endl;
cout << "字母: " << nch << endl;
cout << "其他: " << nother << endl;
return 0;

}