Rotate image

Signed-off-by: begeekmyfriend <[email protected]>

048_rotate_image/Makefile

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+all:
+	gcc -O2 -o test rotate.c

048_rotate_image/rotate.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+static void rotate(int** matrix, int matrixRowSize, int matrixColSize) {
+    int i, j;
+    if (matrixRowSize != matrixColSize) {
+        return;
+    }
+
+    for (i = 0; i < matrixRowSize / 2; i++) {
+        int low = i, high = matrixColSize - i - 1;
+        for (j = low; j < high; j++) {
+            int tmp = matrix[i][j];
+            matrix[i][j] = matrix[matrixColSize - 1 - j][i];
+            matrix[matrixColSize - 1 - j][i] = matrix[matrixRowSize - 1 - i][matrixColSize - 1 - j];
+            matrix[matrixRowSize - 1 - i][matrixColSize - 1 - j] = matrix[j][matrixRowSize - 1 - i];
+            matrix[j][matrixRowSize - 1 - i] = tmp;
+        }
+    }
+}
+
+int main(int argc, char **argv)
+{
+    if (argc != 3) {
+        fprintf(stderr, "Usage: ./test 3 3\n");
+    }
+
+    int i, j, count = 0;
+    int row_size = atoi(argv[1]);
+    int col_size = atoi(argv[2]);
+    int **matrix = malloc(row_size * sizeof(int *));
+    for (i = 0; i < row_size; i++) {
+        matrix[i] = malloc(col_size * sizeof(int));
+        for (j = 0; j < col_size; j++) {
+            matrix[i][j] = count++;
+        }
+    }
+
+    rotate(matrix, row_size, col_size);
+    for (i = 0; i < col_size; i++) {
+        for (j = 0; j < row_size; j++) {
+            printf("%02d ", matrix[i][j]);
+        }
+        putchar('\n');
+    }
+
+    return 0;
+}