如何從類型結構的數組中刪除一個元素?比方說,如果我註冊一個項目,然後想刪除它,我該怎麼做?刪除功能位於代碼的末尾。我想通過給varunummer
(id號)刪除該項目。任何人都知道如何去做?如何從結構數組中刪除元素?
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define WORDLENGTH 30
#define MAX 5
struct varor {
int varunummer;
char namn[WORDLENGTH];
int lagersaldo;
};
int readLine(char s[], int length);
int ifVarunummerExist(int varunummer, const struct varor reg[], int nrOfGoods);
void registerVaror(struct varor reg[], int *nrOfGoods);
void getPrint(const struct varor reg[], int nrOfGoods);
void avregristreraVaror(struct varor reg[], int nrOfGoods);
int main(void) {
struct varor vRegister[WORDLENGTH];
int nrOfGoods = 0;
int run = 1;
while (run) {
char choice;
printf("\n\t\tMeny - Lager Program\n\n\
(1) Register\n\b\b\b\b\
(2) Print\n\
(3) Delete\n\
(4) Quit\n");
scanf(" %c%*c", &choice);
if (choice=='1')
registerVaror(vRegister, &nrOfGoods);
if (choice=='2')
getPrint(vRegister, nrOfGoods);
if (choice=='3')
avregristreraVaror(vRegister, nrOfGoods);
else if (choice=='4')
run = 0;
}
return 0;
}
int ifVarunummerExist(int varunummer, const struct varor reg[], int nrOfGoods) {
int i;
for (i = 0; i < nrOfGoods; i++)
if(reg[i].varunummer == varunummer)
return i;
return -1;
}
int readLine(char s[], int length) {
int ch, i=0;
while (isspace(ch=getchar()));
while (ch != '\n' && ch != EOF) {
if (i < length)
s[i++] = ch;
ch = getchar();
}
s[i] = '\0';
return i;
}
void registerVaror(struct varor reg[], int *nrOfGoods) {
char namn[WORDLENGTH], tmp[WORDLENGTH];
int varunummer, lagersaldo;
if (*nrOfGoods == MAX) {
printf("\nError! Finns inte plats kvar!\n");
return;
}
printf("Ange varunummer: ");
scanf("%d", &varunummer);
if (ifVarunummerExist(varunummer, reg, *nrOfGoods) >= 0) {
printf("\nVarunummer finns redan!\n");
return;
}
reg[*nrOfGoods].varunummer = varunummer;
printf("Ange namn: ");
readLine(reg[*nrOfGoods].namn, WORDLENGTH);
printf("Ange lagersaldo :");
scanf("%d", ®[*nrOfGoods].lagersaldo);
//reg[*nrOfGoods]=createVara(varunummer,namn,lagersaldo);
(*nrOfGoods)++;
}
void getPrint(const struct varor reg[], int nrOfGoods) {
int i;
printf("\nVarunummer \t Namn \t\t\t Lagersaldo\n");
for (i = 0; i < nrOfGoods; i++) {
printf(" %d \t\t %s \t\t\t %d\n",reg[i].varunummer,reg[i].namn,reg[i].lagersaldo);
}
}
void avregristreraVaror(struct varor reg[], int nrOfGoods) {
int run = 1;
while (run) {
char choice;
printf("\n (1) Delete \n (2) Exit");
scanf(" %c", &choice);
//DELETE IF CHOICE 1---------
if (choice == '1') {
int i, varunummer;
printf("Ange varunummer: ");
scanf("%d", &varunummer);
for (i = varunummer + 1; i < MAX; i++) {
reg[i - 1] = reg[i];
}
reg[i] = 0;
}
}
//QUIT TO MY MENU CHOICE 2--------
if (choice == '2')
run = 0;
}
您正在移動將刪除相應元素的值。到底什麼是問題?它不工作嗎?如果不發生什麼事情不應該發生? – Isac
@Isac reg [i] = 0; *分配給struct * varor *與編譯器的類型int-錯誤不兼容 –
該行沒用,沒有必要物理清除最後一個元素的內容,只是減少商品數量。如果你想清除它,請記住它是一個結構體,所以你不能只將它分配給0. – Isac