我想写一个函数，如果它在结构中保存的作者的名字中找到子字符串，则删除结构列表的条目。问题是，strstr()似乎没有找到任何匹配。我不想知道我是否正确地删除了条目，或者以正确的方式移动了列表指针(我想自己弄清楚)。
void z(LIBRARY *first){
int i = 0, j = 0 ;
LIBRARY *nextZ = first->next , *prevZ = first;
char *name = (char*) malloc (102*sizeof(char)), *name2 = (char*) malloc (102*sizeof(char)), c ;
getchar();
fgets(name, 102, stdin); // Function gets the string the user is looking for.
while (name[j]!= ' '){
name[j]= toupper(name[j]); // Converts it to upper case to ignore case types.
j++;
}
j=0;
printf("%s", name);
while ( nextZ ){ // Function starts going through the list of structures
name2 = nextZ->authors; //Function gets string saved in current structure->authors
while (name2[j]!= ' '){
name2[j]= toupper(name2[j]);
j++;
}
j = 0;
printf("%s", name2);
if ( (strstr( name2, name))!=NULL ){
/*This is where the problem is. It seems like
the function never finds a substring in the structure->authors entry.*/
i++;
prevZ->next = nextZ->next;
nextZ = nextZ->next->next;
}
else {
prevZ = prevZ->next;
nextZ = nextZ->next;
}
}
printf("Vymazalo sa %d zaznamovn", i); //Prints out how many entries of the list got deleted.
}
我已经设法解决了我遇到的所有问题-下面是我为感兴趣的人所做的:
void z(LIBRARY *first){
int i = 0, j = 0 ;
LIBRARY *nextZ = first->next , *prevZ = first;
char *name = (char*) malloc (102*sizeof(char)), *name2 = (char*) malloc (102*sizeof(char));
getchar(); //getting an 'n' that could remain from main when calling z()
fgets(name, 102, stdin); //scanning author the user wants to delete
while (name[j]!= ' '){
if (name[j]=='n') { //removing end of line character from user input
name[j]=' ';
break;
}
if (name[j]>='a' && name[j]<='z') name[j]= toupper(name[j]); //chaning user choice to upper case letters for string comparison
j++;
}
j=0;
while ( nextZ ){ //While cycle that goes through the list of structures
strcpy(name2, nextZ->authors); //gets author name from current list entry
while (name2[j]!= ' '){
if (name2[j]>='a' && name2[j]<='z') name2[j]= toupper(name2[j]); //Once again- change to upper case for string comparison
j++;
}
j = 0;
if ( (strstr(name2,name))!=NULL ){ //strstr- returns a pointer if match is found- otherwise returns NULL
i++;
prevZ->next = nextZ->next; //removes the entries from the list
nextZ = nextZ->next;
}
else { //if strings dont match the list moves to the next entry
prevZ = prevZ->next;
nextZ = nextZ->next;
}
}
printf("%d entries deleted.n", i); //prints out number of deleted entries
}