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3.cpp

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+#include <stdio.h>
+#include <stdlib.h>
+#include <ctime>
+#define SIZE 1024
+
+void matmul(float** A, float** B, float** C, int n) {
+	for(int i=0;i<n;i++){
+        for (int j=0;j<n;j++){
+        	C[i][j]=0;
+            for(int k=0;k<n;k++){
+                C[i][j]+=A[i][k]*B[k][j];
+            }
+        }
+    }
+}
+
+int main(){
+	//分配矩阵内存 
+    float** A=new float*[SIZE];
+    float** B=new float*[SIZE];
+    float** C=new float*[SIZE];
+    
+    for(int i=0;i<SIZE;i++){
+        A[i]=new float[SIZE];
+        B[i]=new float[SIZE];
+        C[i]=new float[SIZE];
+    }
+    
+    //初始化 
+    srand(time(NULL));
+    for(int i=0;i<SIZE;i++){
+    	for(int j=0;j<SIZE;j++){
+	        A[i][j]=rand()%100;
+	        B[i][j]=rand()%100;    		
+		}
+    }
+        
+    //计时并输出 
+    clock_t start=clock();
+    matmul(A,B,C,SIZE); 
+    clock_t end=clock();
+    printf("初始稠密矩阵乘法时间：%f秒\n",(double)(end-start)/CLOCKS_PER_SEC); 
+    
+    for(int i=0;i<SIZE;i++){
+    	delete[] A[i];
+    	delete[] B[i];
+    	delete[] C[i];
+	}
+	delete[] A;
+	delete[] B;
+	delete[] C;
+    
+    return 0;
+}