i have code,which takes input of 3 students division , b each. 2 divions sorted , merged in 3rd array according birth dates of students. swap function ,i have not passed refrence still swapping , sort output correct !!!.
note:the line below #include..
void swap(struct a,struct b) it should
void swap(struct student a,struct student b) but without changing program runnong , giving correct outputs !! how ??
#include<iostream> #include<string.h> using namespace std; void swap(struct a,struct b); void findweek(struct student ar[10],int l,int bd1,int bm1); struct student { //m month , b birthdate prn=prn number,name=name of student int m,bd; char prn[10],name[10]; }; int main() { //2 divisions , b declared , merged c struct student a[3], b[3], c[6]; //division input for(int i=0;i<3;i++) { cout<<" enter name of student "<<endl; cin>>a[i].name; cout<<"enter prn no. "<<endl; cin>>a[i].prn; cout<<"enter birth day "<<endl; cin>>a[i].bd; cout<<"enter birth month "<<endl; cin>>a[i].m; } //sorting of for(int i=0;i<3;i++) { for(int j=i;j<3;j++) { if(a[i].m>a[j].m) { swap(a[i],a[j]); } else if(a[i].m==a[j].m) { if(a[i].bd>a[j].bd) { swap(a[i],a[j]); } } } } //division b input for(int i=0;i<3;i++) { cout<<" enter name of student "<<endl; cin>>b[i].name; cout<<"enter prn no. "<<endl; cin>>b[i].prn; cout<<"enter birth day "<<endl; cin>>b[i].bd; cout<<"enter birth month "<<endl; cin>>b[i].m; } //sorting of b for(int i=0;i<3;i++) { for(int j=i;j<3;j++) { if(b[i].m>b[j].m) { swap(b[i],b[j]); } else if(b[i].m==b[j].m) { if(b[i].bd>b[j].bd) { swap(b[i],b[j]); } } } } cout<<"-----------------------"<<endl; cout<<"division a"<<endl; int count=0; for(int i=0;i<3;i++) { //c has merged array , being filled first c[i]=a[i]; count++; cout <<c[i].name<<"\t"<<c[i].prn<<"\t"<<c[i].bd<<"|"<<c[i].m<<endl; } cout<<"division b"<<endl; for(int i=0;i<3;i++) { //resume filling array count c[count]=b[i]; cout <<c[count].name<<"\t"<<c[count].prn<<"\t"<<c[count].bd<<"|"<<c[count].m<<endl; count++; } int bd1,bm1; cout<<"enter date find birthdays in week "<<endl; cin>>bd1; cout<<"enter corresponding month "<<endl; cin>>bm1; findweek(c,count,bd1,bm1); return 0; } //to swap structure student arrays sorting void swap(struct student a,struct student b) { struct student t; t=a; a=b; b=t; } void findweek(struct student ar[10],int l,int bd1,int bm1) { int count=0; for(int i=0;i<l;i++) { int month_end=30; int next_month=bm1+1; //if(bd1>=23) int end_date=bd1+7-month_end; // else int endofweek=bd1+7; //l length of ar , ar=copy of merged array, bd1&bm1 date , month search birthday in week if((ar[i].m==bm1&&ar[i].bd>=bd1&&ar[i].bd<=endofweek)||ar[i].m==bm1+1&&ar[i].bd<=end_date) { if(month_end-bd1>7) cout <<ar[i].name<<"\t"<<ar[i].prn<<"\t"<<ar[i].bd<<"|"<<ar[i].m<<endl; else { if((ar[i].m==bm1&&ar[i].bd>=bd1)||(ar[i].m==next_month&&ar[i].bd<=end_date)) { cout <<ar[i].name<<"\t"<<ar[i].prn<<"\t"<<ar[i].bd<<"|"<<ar[i].m<<endl; } } count++; if(count>7) break; } } }
it compiles if remove line:
void swap(struct a,struct b); also, compiles if remove whole swap function.
how it?
quite simple.
you defining function takes 2 arguments: incomplete type struct a , incomplete type struct b.
function discarded overload set while searching 1 used @ function call.
main not using swap function. instead, it's using 1 std:: namespace.
introduced iostream or string, it's implementation defined.
try changing name of function or putting throw in implementation of swap. in second case, runtime won't affected.
minimal, (not-)working example reproduce issue:
void f(struct s); struct s {}; int main() { f(s{}); } void f(s) {} as can see, error referring incomplete type struct s.
swap kinda of somehow misleading example compiles reasons above.
reproducing issue minimal example helpful.
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