An article has several lines, and a blank line is used as the input end condition. Count the number of words the (regardless of case, words, the are separated by spaces) in an article (C++ exercises)

Count the number of words specified in several lines of input

In this article we take the word the as an example

Implementation ideas

• Call the API to get a line of characters, and strcmp() determine whether there is an input blank line
• Write a function to count the number of specified words
• Case insensitivity requires converting characters to lowercase and comparing each position

code

#include <iostream>
#include <cctype>
#include <cstring>
using namespace std;

int countThe(char s[])
{
    
    
	int i,count=0,len;
	for(i=0;s[i]!='\0';i++){
    
    
		if(s[i] !=' '){
    
    
		//	cout<< s[i]<<s[i+1]<<s[i+2]<<" ";
			if(tolower(s[i])== 't'&& tolower(s[i+1])=='h'&& tolower(s[i+2])=='e')
				count++;
		}
	}
	return count;
}

int main()
{
    
    
	char s[80];
	int count=0;
	cout<<"请输入字符串：（以空行结束）"<<endl;
	cin.getline(s,80);
	// 将输入的s字符串和 ""比较小于等于0 为false 退出 
	while(strcmp(s,""))
	{
    
    	
		count+=countThe(s);
		cout<<"请输入字符串："<<endl;
		cin.getline(s,80);
	}
	cout<<"单词the的个数为："<<count<<endl;
	return 0;
}

Test effect