C语言数组编程题?
度娘打格式太麻烦了,参考图片格式吧。
#define _CRT_SECURE_NO_DEPRECATE
#include<stdio.h>
#include<iostream>
using namespace std;
int main() {
FILE *fp;
fp = fopen("C:\\Users\\93482\\Desktop\\original.txt", "r+");
if (fp == NULL) {
printf("File open error");
return 0;
}
int a[100];
int k = 0;
while (!feof(fp)) {
fscanf(fp,"%d", &a[k++]);
if (feof(fp))break;
}
printf("Plese input the number you want to insert:");
int x;
scanf("%d", &x);
for (int i = 0; i < k; i++) {
if (a[i] > x) {
for (int j = k; j >= i; j--) {
a[j + 1] = a[j];
}
a[i] = x;
k++;
break;
}
}
fclose(fp);
fp = fopen("C:\\Users\\93482\\Desktop\\original.txt", "w");
for (int i = 0; i < k; i++) {
fprintf(fp,"%d ", a[i]);
}
fclose(fp);
}
你确定这个对?
你上编译器跑一下就知道了啊,吧那个路径改一下就行,我这测试没问题
#include<stdio.h>
int main()
{
FILE *fin;
int x;
int *a,N,i;
static int t; //用 static , 可适用于大的文件反复地读
fin=fopen("original.txt","r");
if (!fin){
printf("file open err, exit!\n");return 1;
};
N=0;
while(1){
if (fscanf(fin,"%d",&t)==1) N++;
if (feof(fin)) break;
}
// printf("N=%d\n",N);
rewind(fin);
a = (int *) malloc(sizeof(int)*N);
for (i=0;i<N;i++) fscanf(fin,"%d",&a[i]);
fclose(fin);
fin=fopen("original.txt","w");
printf("input x: ");
scanf("%d",&x);
if (x<=a[0]){
fprintf(fin,"%d ",x);
for (i=0;i<N;i++) fprintf(fin,"%d ",a[i]);
}else if (x>=a[N-1]){
for (i=0;i<N;i++) fprintf(fin,"%d ",a[i]);
fprintf(fin,"%d ",x);
} else {
fprintf(fin,"%d ",a[0]);
for (i=1;i<N;i++){
if (x>a[i-1] && x<=a[i]) fprintf(fin,"%d ",x);
fprintf(fin,"%d ",a[i]);
}
};
fclose(fin);
return 0;
}