宅宅情侶的成長日記

這隻程式分別使用迴圈和calloc的方法來對陣列初始化

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main()
{
	int n = 1024 * 1024 * 128 * sizeof(char);
	double rTime;
	clock_t clk0 , clk1;
	
	clk0 = clock();
	char *pc = (char *)malloc(n);
	int i;
	for(i = 0 ; i < n ; i++)
		pc[i] = 0;
	clk1 = clock();
	rTime = (double)(clk1 - clk0) / (double)CLOCKS_PER_SEC;
	printf("iterative clearing time: %f\n" , rTime);
	free(pc);
	
	clk0 = clock();
	pc = (char *)calloc(n , sizeof(char));
	clk1 = clock();
	rTime = (double)(clk1 - clk0) / (double)CLOCKS_PER_SEC;
	printf("calloc time: %f\n" , rTime);
	free(pc);
	
	getchar();
	return 0;
}

可以看到其結果可以差到千倍之多呢@@"