C语言小程序(六)、数组操作
对数组进行操作,查找、插入、删除。
#include <stdio.h> #include <stdlib.h> #include <time.h> int size = 0; int flag = 0; void output(int *arry) { int i = 0; for(i=0; i<size; i++) { printf("arry[%d]=%d\t",i,arry[i]); if((i+1)%5 == 0) printf("\n"); } printf("\n"); } void getarry(int *arry) { int i = 0; srand(time(NULL)); for(i=0; i<size; i++) { arry[i] = rand() % 100; } } void add(int *arry, int pos, int num) { int i = 0; if(pos>=0 && pos<=size) { if(pos < size) //在中间插入 { for(i=size; i>pos; i--) { arry[i] = arry[i-1]; } arry[pos] = num; } else //在最后的位置插入 { arry[size] = num; } size++; } else printf("只能在0-%d的位置插入。\n",size); } int search(int *arry, int num) { static int pos = 0; if(flag) pos++; for(; pos<size; pos++) { if(arry[pos] == num) { flag = 0; return pos; } } return -1; } void mod(int *arry, int pos, int num) { if(pos>=0 && pos<size) { arry[pos] = num; } else { printf("输入位置错误。\n"); } } int del(int *arry, int num) { int count = 0; int pos = 0; int i = 0; pos=search(arry, num); while(pos+1) { for(i=pos; i<size; i++) { arry[i] = arry[i+1]; } count++; pos=search(arry, num); } return count; } int main() { //pos 0到size-1 int *arry = NULL; int count = 0; int pos = 0; int num = 0; printf("输入要产生多少个随机数:"); scanf("%d",&size); arry = malloc(2*size*sizeof(int)); getarry(arry); output(arry); printf("输入要添加的位置(0-%d):",size); scanf("%d",&pos); printf("输入要添加的数字:"); scanf("%d",&num); add(arry, pos, num); output(arry); printf("输入要查找的数字:"); scanf("%d",&num); pos=search(arry, num); while(pos+1) { flag = 1; count++; printf("arry[%d]=%d\n",pos, num); pos=search(arry, num); } printf("共找到%d个匹配数字\n",count); printf("输入要修改的位置:"); scanf("%d",&pos); printf("输入要修改为数字:"); scanf("%d",&num); mod(arry, pos, num); output(arry); printf("输入要删除的数字:"); scanf("%d",&num); del(arry, num); output(arry); free(arry); arry = NULL; return 0; }