C语言中动态内存分配功能的示例程序
问题
如何使用C语言中的动态内存分配功能显示和计算n个数字的和?
解决方案
以下是C语言程序,用于显示元素并通过使用动态内存分配函数由用户计算n个数字的总和。在这里,我们还尝试减少内存浪费。
示例
#include<stdio.h>输出结果#include<stdlib.h>
void main(){
//Declaring variables and pointers,sum//
int numofe,i,sum=0;
int *p;
//Reading number of elements from user//
printf("输入元素数: ");
scanf("%d",&numofe);
//Calling malloc() function//
p=(int *)malloc(numofe*sizeof(int));
/*Printing O/p - We have to use if statement because we have to check if memory has been successfully allocated/reserved or not*/
if (p==NULL){
printf("Memory not available");
exit(0);
}
//Printing elements//
printf("Enter the elements : \n");
for(i=0;i<numofe;i++){
scanf("%d",p+i);
sum=sum+*(p+i);
}
printf("\nThe sum of elements is %d",sum);
free(p);//Erase first 2 memory locations//
printf("\nDisplaying the cleared out memory location : \n");
for(i=0;i<numofe;i++){
printf("%d\n",p[i]);//Garbage values will be displayed//
}
}
执行以上程序后,将产生以下结果-
Enter the number of elements: 4Enter the elements:
23
45
67
89
The sum of elements is 224
Displaying the cleared out memory location:
7410816
0
7405904
0
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