c - sort an array of struct alphabetically with names that have spaces -

i have struct

struct bookinfo {     char title[50];     int numauthors;     char authors[50][50];     int year;     int checkedout; }; 

i can sorted years cannot sort titles life of me code print out names in order in file or "incompatible types in assingment" errors comented lines

int j,i;     char temp;     for(i = 1; < 14; i++)     {         j = - 1;         while( j >= 0 && strcmp( library[j+1].title, library[j].title) < 0 )         {             temp =  library[j + 1]; /*errors*/             library[j+1] = library[j];             library[j] = temp; /*errors*/             j--;         }         printf("n%s",library[j].title);     } 

what doing wrong here?

you sorting bookinfo instances, temp variable should of same type instead of char:

int j,i; bookinfo temp;