本博文主要讲解equal 和 mismatch的使用方法
实例1 /* *【1】equal 判断两个数组是否是相等的 *【2】mismatch 找到两个数组第一队不相等的数 */ #include <iostream> #include <algorithm> #include <vector> using namespace std; int main() { int a[] = {3,2,4,5,6,1}; int b[] = {3,2,4,5,1,6}; int len1 = sizeof(a)/sizeof(int); int len2 = sizeof(b)/sizeof(int); //equal if(len1 == len2) { if(equal(a,a+len1,b)) cout<<"equal"<<endl; else cout<<"not equal"<<endl; } else { cout<<"not equal"<<endl; } mismatch pair<int*,int*> p = mismatch(a,a+len1,b); cout<<"第一对不相等的位置为："<<p.first - a<<endl; cout<<"值为："<<*p.first<<" "<<*p.second<<endl; system("pause"); return 0; } 实例2 #include <iostream> #include <algorithm> #include <vector> #include <string> using namespace std; class student { public: int stdno; string stdName; int grade; student(int stdno,string stdName,int grade) { this->stdno = stdno; this->stdName = stdName; this->grade = grade; } bool operator==(student s) { return this->grade == s.grade; } }; ostream& operator<<(ostream& os,student& s) { os<<"学号："<<s.stdno<<"\t姓名："<<s.stdName<<"\t分数："<<s.grade<<endl; return os; } int main() { vector<student>stdVec1; vector<student>stdVec2; student s1(1,"lijia",70); student s2(2,"renyin",80); student s3(3,"zhangchen",90); student s4(4,"lijia",70); student s5(5,"renyin",80); student s6(6,"zhangchen",100); stdVec1.push_back(s1); stdVec1.push_back(s2); stdVec1.push_back(s3); stdVec2.push_back(s4); stdVec2.push_back(s5); stdVec2.push_back(s6); typedef vector<student>::iterator it; pair<it,it>result = mismatch(stdVec1.begin(),stdVec1.end(),stdVec2.begin()); cout<<"第一对不相等的学生信息如下："<<endl; student& std1 = *result.first; student& std2 = *result.second; //cout<<"学号："<<std1.stdno<<"\t姓名："<<std1.stdName<<"\t分数："<<std1.grade<<endl; //cout<<"学号："<<std2.stdno<<"\t姓名："<<std2.stdName<<"\t分数："<<std2.grade<<endl; cout<<std1<<endl; cout<<std2<<endl; system("pause"); return 0; }