初学链表，有关单链表的程序有几处错，求高手们改错或完善
建立一个结构体可存储7个人数据（姓名，电话），然后用链表编写，使用户可以从第一个位置添加及删除，从最后一个位置添加及删除，也可以删除任意制定位置的信息，并且显示出来
程序代码：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct Contact
{
struct Contact* next;
char name[7];
char tel;
}Contact;
Contact*start=NULL;
void printList(Contact*a)
{
if(a==NULL){
printf("no contact given");
}
else{
printf("\nName:%s \nTel:%f", a->name,a->tel);
}
}
void addFirst(Contact*a){
struct Contact*newA;
newA=malloc(sizeof(Contact));
printf("Name:");
scanf("%6s",&(newA->name));
printf("Tel:");
scanf("%f",&(newA->tel));
return newA;
void push(Contact*newA){
if(start==NULL){
start=newA;
start->next=NULL;
}else{
newA->next=start;
start=newA;
}
}
}
void addLast(Contact*a){
struct Contact*newA;
newA=malloc(sizeof(Contact));
printf("Name:");
scanf("%6s",&(newA->name));
printf("Tel:");
scanf("%s",&(newA->tel));
return newA;
}
void removeByName(char*removeByName){
printf("0");
Contact*ptr=start;
Contact*last_ptr=start;
if(start==NULL) return;
if(strcmp(start->name,removeByName)==0){
ptr=start;
start=start->next;
}
else
{
while(ptr!=NULL){
if(strcmp(ptr->name,removeByName)==0){
break;
}
last_ptr=ptr;
ptr=ptr->next;
}
last_ptr->next=ptr->next;
}
free(ptr);
}
void removeFirst()
{
Contact*pop(){
if(start==NULL) treurn NULL;
Contact*help=start;
start=start->next;
return help;
}
}
void removeLast()
{
void push(Contact*newA){
if(start==NULL){
start=newA;
start->next=NULL;
} else{
newA->next=start;
start=newA;
}
}
Contact*pop(){
if(start==NULL) treurn NULL;
Contact*help=start;
start=start->next;
return help;
}
}
void builtList(Contact contacts[])
{
Contact *ptr=NULL;
int i;
for(i=0; i<=6; i++)
{
ptr=&contacts[i];
addLast(ptr);
}
}
int main()
{Contact*a;
printStack();
Contact contacts[7]=
{
{NULL,"Dennis","0203/123456"},
{NULL,"Chantal","0177/3123345"},
{NULL,"Robert","0163/9295986"},
{NULL,"Bjoern","040 - 123232345"},
{NULL,"Andreas","+49 178 11903123"},
{NULL,"Jenny","+41 119 34544345"},
{NULL,"Zeuss","0162-123-4531698"},
};
int choose;
do{
printf("1.Removing name Andreas\n");
printf("2.Removing first\n");
printf("3.Removing last\n");
printf("4.Exit\n");
printf("Input:");
scanf("%i",&choose);
printf("\n");
switch(choose)
{
case 1: removeByName(char*removeByName); //此处程序报错，不知道怎么改//
printList(Contact*a);
break;
case 2: removeFirst();
printList(Contact*a);
break;
case 3:removeLast();
printList(Contact*a);
break;
}while(choose!=4);
return 0;
}
