C13-二维数组

原题链接：37014.笔记汇总

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2025-05-29 19:12:47

发布于：江苏

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1. 循环嵌套

T40243.乘法口诀表

#include <iostream>
using namespace std;

int main()
{
	int n;
	cin >> n;
	if (n == 0){
		cout <<"Error";
		return 0;
	}
	for (int i=1; i<=n; i++){	//行 
		for (int j=1; j<=n; j++){ //列 
			printf("%dx%d=%2d ", i, j, i*j);
			//printf("%.2lf", 3.145);
		}
		cout << endl;
	}

	return 0;
}

//一维数组, 循环的嵌套

2. 二维数组

T40233.二维数组初始化

#include <iostream>
using namespace std;

int main()
{
	int a[3][5] = {
		{1, 2, 3, 4, 5}, 
		{6, 7, 8, 9, 0}, 
		{16, 12, 14, 11, 29}
	};
	
	for (int i=0; i<3; i++){	//i表示行 
		for(int j=0; j<5; j++){ //j表示列 
			//输出第i行第j列的元素 
			cout << a[i][j] << ' ';
		} 
		cout << endl;
		
	}
	return 0;
}

T40234.二维数组的一行

#include <iostream>
using namespace std;

int main()
{
	int a[3][5] = {
		{1, 2, 3, 4, 5}, 
		{6, 7, 8, 9, 0}, 
		{16, 12, 14, 11, 29}
	};
	int k; 
	cin >>k; 
	for (int i=0; i<=4; i++){
		cout << a[k-1][i] <<' ';
	}
	return 0;
}

T40235.二维数组输入输出

#include<iostream>
using namespace std;
int main(){
    int a[105][105] = {};
    int n,m;
    cin >> n >> m;
    for (int i=1;i<=n;i++){
        for (int j=1; j<=m;j++){
            cin >>a[i][j];
        }
    }
    for (int i=1;i<=n;i++){
        for (int j=1;j<=m;j++){
            cout<<a[i][j]<<" ";
        }
        cout<<endl;
    }
    return 0;
}

T40236.数0

#include <iostream>
using namespace std;

int main()
{
	int t, n, m, cnt = 0;
	cin >> n >> m; 
	//下标默认是从0开始,也可以从1开始存储 
	for (int i=1; i<=n; i++){
		for (int j=1; j<=m; j++){
			cin >> t;
			if (t == 0){
				cnt++;
			}
		}
	}
	cout << cnt;


	return 0;
}

T40237.行逆序输出

#include <iostream>
using namespace std;

int main()
{
	int a[105][105] = {};
	int n, m;
	cin >> n >> m; 
	//下标默认是从0开始,也可以从1开始存储 
	for (int i=1; i<=n; i++){
		for (int j=1; j<=m; j++){
			cin >> a[i][j];
		}
	}
	//行逆序, 循环输出二维数组 
	for (int i=n; i>=1; i-- ){
		for (int j=1; j<=m; j++){
			cout <<a[i][j] <<' ';
		}
		cout <<endl;
	}
	return 0;
}