程序流程图1、creat( );/创建链表airticket *psps-num!=0head=NULLhead=pspEnd=pspEnd-next=pspEnd-next=NULL2、save( );/保存文档(fp=fopen(“1.txt”)return;head1fwrite(head1,sizeof(airticket,1,fp);head1=head-nextfclose(fp);3、tuipiao( );/退票airticket*tail,*temp=newairtickettemp-next=NULL:coutnext(fp=fopen(“1.txt”,“b”)head=NULL（fread(temp,sizeoofcoutnext=NULL;head=tail=temp;head-nextcoutnext=NULL;head=tail=temp;head-nextcoutnextIFheaddeletetail,tempIF6、search_day( );/按日期查询int day,m;(fp=fopen(“1.txt”IFcoutnext;IF7、change( );/修改航班信息int num;(fp=fopen(1.txt”)cout=0&i=1&j=2;break;IFIFcout“按错键，请重新选择”;