c++作业6

#include<iostream>using namespace std;int main(){    int i=0,j=0,t=0,sum1=0,sum2=0,a[3][3];cout<<"请输入矩阵";for(i=0;i<3;i++)for(j=0;j<3;j++)cin>>a[i][j];for(i=0;i<3;i++)for(j=0;j<3;j++){           if(i==j) sum1+=a[i][j];if(i+j==2)sum2+=a[i][j];}  t=sum1+sum2;cout<<"对角线元素之和"<<t<<endl;}

#include<iostream>#include<string>using namespace std;int main(){string a,b;cout<<"字符串a,b为:";cin>>a;cin>>b;{if(a==b)cout<<"两个字符串相等";elsecout<<"两个字符串不相等"<<endl;}cout<<"字符串ab为"<<a+b;return 0;}