C语言 数组元素的遍历

一维数组

#include <stdio.h>
int main(){
    int nums[10];
    int i;
   
    //从控制台读取用户输入
    for(i=0; i<10; i++){
        scanf("%d", &nums[i]);  //注意取地址符 &，不要遗忘哦
    }
   
    //依次输出数组元素
    for(i=0; i<10; i++){
        printf("%d ", nums[i]);
    }
   
    return 0;
}

#include <stdio.h>
int main(){
    int nums[10] = {1, 10, 6, 296, 177, 23, 0, 100, 34, 999};
    int i, num, thisindex = -1;
   
    printf("Input an integer: ");
    scanf("%d", &num);
    for(i=0; i<10; i++){
        if(nums[i] == num){
            thisindex = i;
            break;
        }
    }
    if(thisindex < 0){
        printf("%d isn't  in the array.\n", num);
    }else{
        printf("%d is  in the array, it's index is %d.\n", num, thisindex);
    }
    return 0;
}

二维数组

#include <stdio.h>
void bian(int row,int col,int *a)
{
    int i,j;
    for(i=0;i<row;i++)
        for(j=0;j<col;j++)
            printf("%d  ",*(a+col*i+j));
}
int main()
{
    int a[3][4]={34,45,6,67,453,456,4,34,56,67,345};
    bian(3,4,a);
}

#include <stdio.h>
int main(){
    int i, j;  //二维数组下标
    int sum = 0;  //当前科目的总成绩
    int average;  //总平均分
    int v[3];  //各科平均分
    int a[5][3] = {{80,75,92}, {61,65,71}, {59,63,70}, {85,87,90}, {76,77,85}};
    for(i=0; i<3; i++){
        for(j=0; j<5; j++){
            sum += a[j][i];  //计算当前科目的总成绩
        }
        v[i] = sum / 5;  // 当前科目的平均分
        sum = 0;
    }
    average = (v[0] + v[1] + v[2]) / 3;
    printf("Math: %d\nC Languag: %d\nEnglish: %d\n", v[0], v[1], v[2]);
    printf("Total: %d\n", average);
    return 0;
}