How to compare numbers in a C language array

In the C language, we can use comparison operators (such as <, >, <=, >=, ==, !=) to compare the sizes of numbers in an array. The specific method is as follows:

1. For a one-dimensional array, you can iterate through the elements using a loop and then use comparison operators to compare the sizes of adjacent elements.

int arr[] = {5, 2, 9, 1, 7};
int size = sizeof(arr) / sizeof(arr[0]);

for (int i = 0; i < size - 1; i++) {
    if (arr[i] > arr[i+1]) {
        // arr[i]大于arr[i+1]
        // 执行相应的操作
    } else if (arr[i] < arr[i+1]) {
        // arr[i]小于arr[i+1]
        // 执行相应的操作
    } else {
        // arr[i]等于arr[i+1]
        // 执行相应的操作
    }
}

1. For a 2D array, you can use nested loops to iterate through the elements in the array, and compare adjacent elements using comparison operators.

int arr[][] = {{5, 2, 9}, {1, 7, 4}};
int rows = sizeof(arr) / sizeof(arr[0]);
int cols = sizeof(arr[0]) / sizeof(arr[0][0]);

for (int i = 0; i < rows; i++) {
    for (int j = 0; j < cols - 1; j++) {
        if (arr[i][j] > arr[i][j+1]) {
            // arr[i][j]大于arr[i][j+1]
            // 执行相应的操作
        } else if (arr[i][j] < arr[i][j+1]) {
            // arr[i][j]小于arr[i][j+1]
            // 执行相应的操作
        } else {
            // arr[i][j]等于arr[i][j+1]
            // 执行相应的操作
        }
    }
}

By comparing the numbers in the array, we can perform corresponding operations based on our actual needs, such as swapping positions, sorting, finding the maximum or minimum values, and so on.