C语言利用数组计算矩阵乘法

本文比较了各个版本的矩阵乘法计算

IJK版本

#include <stdio.h>
int main()
{
	int A[2][2] = { 0,1,2,3 };
	int B[2][2] = { 4,5,6,7 };
	int C[2][2] = { 0,0,0,0 };
	int num = 2;
	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			for (int k = 0; k < num; k++) {
				C[i][j] += A[i][k] * B[k][j];
			}
		}
	}

	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			printf_s("C[%d][%d] = %d\t\t", i, j, C[i][j]);
		}
		printf_s("\r\n");
	}
	printf_s("\r\n");

	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			printf_s("&C[%d][%d] = %p\t", i, j, &C[i][j]);
		}
		printf_s("\r\n");
	}
	printf_s("\r\n");
}

JIK版本

#include <stdio.h>
int main()
{
	int A[2][2] = { 0,1,2,3 };
	int B[2][2] = { 4,5,6,7 };
	int C[2][2] = { 0,0,0,0 };
	int num = 2;
	for (int j = 0; j < num; ++j) {
		for (int i = 0; i < num; ++i) {
			for (int k = 0; k < num; k++) {
				C[i][j] += A[i][k] * B[k][j];
				printf_s("C[%d][%d] += A[%d][%d] * B[%d][%d] = %d\t\t", i, j, i, k, k, j, C[i][j]);
			}
			printf_s("\r\n");
		}
	}
	printf_s("\r\n");

	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			printf_s("C[%d][%d] = %d\t\t", i, j, C[i][j]);
		}
		printf_s("\r\n");
	}
	printf_s("\r\n");

	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			printf_s("&C[%d][%d] = %p\t", i, j, &C[i][j]);
		}
		printf_s("\r\n");
	}
	printf_s("\r\n");
	return 0;
}

JKI版本

#include <stdio.h>
int main()
{
	int A[2][2] = { 0,1,2,3 };
	int B[2][2] = { 4,5,6,7 };
	int C[2][2] = { 0,0,0,0 };
	int num = 2;
	for (int j = 0; j < num; ++j) {
		for (int k = 0; k < num; k++) {
			for (int i = 0; i < num; ++i) {
				C[i][j] += A[i][k] * B[k][j];
				printf_s("C[%d][%d] += A[%d][%d] * B[%d][%d] = %d\t\t", i, j, i, k, k, j, C[i][j]);
			}
			printf_s("\r\n");
		}
	}
	printf_s("\r\n");

	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			printf_s("C[%d][%d] = %d\t\t", i, j, C[i][j]);
		}
		printf_s("\r\n");
	}
	printf_s("\r\n");

	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			printf_s("&C[%d][%d] = %p\t", i, j, &C[i][j]);
		}
		printf_s("\r\n");
	}
	printf_s("\r\n");
	return 0;
}

KJI版本

#include <stdio.h>
int main()
{
	int A[2][2] = { 0,1,2,3 };
	int B[2][2] = { 4,5,6,7 };
	int C[2][2] = { 0,0,0,0 };
	int num = 2;
	for (int k = 0; k < num; k++) {
		for (int j = 0; j < num; ++j) {
			for (int i = 0; i < num; ++i) {
				C[i][j] += A[i][k] * B[k][j];
				printf_s("C[%d][%d] += A[%d][%d] * B[%d][%d] = %d\t\t", i, j, i, k, k, j, C[i][j]);
			}
			printf_s("\r\n");
		}
	}
	printf_s("\r\n");

	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			printf_s("C[%d][%d] = %d\t\t", i, j, C[i][j]);
		}
		printf_s("\r\n");
	}
	printf_s("\r\n");

	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			printf_s("&C[%d][%d] = %p\t", i, j, &C[i][j]);
		}
		printf_s("\r\n");
	}
	printf_s("\r\n");
	return 0;
}

KIJ版本

#include <stdio.h>
int main()
{
	int A[2][2] = { 0,1,2,3 };
	int B[2][2] = { 4,5,6,7 };
	int C[2][2] = { 0,0,0,0 };
	int num = 2;
	for (int k = 0; k < num; k++) {
		for (int i = 0; i < num; ++i) {
			for (int j = 0; j < num; ++j) {
				C[i][j] += A[i][k] * B[k][j];
				printf_s("C[%d][%d] += A[%d][%d] * B[%d][%d] = %d\t\t", i, j, i, k, k, j, C[i][j]);
			}
			printf_s("\r\n");
		}
	}
	printf_s("\r\n");

	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			printf_s("C[%d][%d] = %d\t\t", i, j, C[i][j]);
		}
		printf_s("\r\n");
	}
	printf_s("\r\n");

	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			printf_s("&C[%d][%d] = %p\t", i, j, &C[i][j]);
		}
		printf_s("\r\n");
	}
	printf_s("\r\n");
	return 0;
}

IKJ版本

#include <stdio.h>
int main()
{
	int A[2][2] = { 0,1,2,3 };
	int B[2][2] = { 4,5,6,7 };
	int C[2][2] = { 0,0,0,0 };
	int num = 2;
	for (int i = 0; i < num; ++i) {
		for (int k = 0; k < num; k++) {
			for (int j = 0; j < num; ++j) {
				C[i][j] += A[i][k] * B[k][j];
				printf_s("C[%d][%d] += A[%d][%d] * B[%d][%d] = %d\t\t", i, j, i, k, k, j, C[i][j]);
			}
			printf_s("\r\n");
		}
	}
	printf_s("\r\n");

	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			printf_s("C[%d][%d] = %d\t\t", i, j, C[i][j]);
		}
		printf_s("\r\n");
	}
	printf_s("\r\n");

	for (int i = 0; i < num; ++i) {
		for (int j = 0; j < num; ++j) {
			printf_s("&C[%d][%d] = %p\t", i, j, &C[i][j]);
		}
		printf_s("\r\n");
	}
	printf_s("\r\n");
	return 0;
}

外部参考

深入理解计算机系统（第三版）