[Yumna Athif]

Hi everyone,
I'm compiling coding for a periodic table in Dev C++, but I'm using c programming language. I met a warning "no return statement in function returning non-void [-Wreturn-type]" when compiling. This warning occurred in the last line, getch();}} line 335.
This is very long but still, can someone help me figure out how to get rid of this error? Thank you so much in advance.

The code is:

#include<stdio.h>
#include<conio.h>
int main();
char clrscr()
{
int
gpn,atm,prdnm,i,a[]={5,13,31,49,81},b[]={6,14,32,50,83},c[]={7,15,33,51,83},d[]={8,16,34,52,84},e[]={9,17,35,53,85},f[]={2,10,18,36,54,86};
int *fe,*ae,*be,*ce,*de,*ee;
char ch;
clrscr();
ae=&a[0];
be=&b[0];
ce=&c[0];
de=&d[0];
ee=&e[0];
fe=&f[0];
printf("\n\t************************************** ***********");
printf("\n\t* PERODIC TABLE *");
printf("\n\t************************************** ***********\n\n");


printf("\n\t\t\t ~~~~~~~~~~~~~~~~~");
printf("\n\t\t\t| |");
printf("\n\t\t\t| P block |");
printf("\n\t\t\t| |");
printf("\n\t\t\t ~~~~~~~~~~~~~~~~~\n\n");
z: ;
{
printf("\n\t#Enter the atomic number = ");
scanf("%d",&atm);
if(atm>=5&&atm<=10)
{
printf("\n\t#period = 2");
}
else if(atm>=13&&atm<=18)
{
printf("\n\t#period =3");
}
else if(atm>=31&&atm<=36)
{
printf("\n\t#period =4");
}
else if(atm>=49&&atm<=54)
{
printf("\n\t#period =5");
}
else if(atm>=81&&atm<=86)
{
printf("\n\t#period =6");
}
else
{
printf("\n\t\t!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!");
printf("\n \t\t\tELEMENT NOT IN THIS BLOCK");
}
{
for(i=0;i<=4;i++)
{
if(*(ae+i)==atm)
{
gpn=13;
printf("\n \t\t\tBORON family");
printf("\n\t\t#group number=13");
}}}
{for(i=0;i<=4;i++)
{if(*(be+i)==atm){
gpn=14;
printf("\n\t\t CARBON family");
printf("\n\t\t#group number=14");
}}}{
for(i=0;i<=4;i++)
{ if(*(ce+i)==atm){
gpn=15;
printf("\n\t\t NITROGEN family or pnicogen");
printf("\n\t\t#group number=15");
}}}{
for(i=0;i<=4;i++)
{if(*(de+i)==atm){
gpn=16;
printf("\n\t\t OXYGEN family");
printf("\n\t\t#group number=16");
}}}
{
for(i=0;i<=4;i++)
{
if(*(ee+i)==atm)
{
gpn=17;
printf("\n\t\t HALOGEN family");
printf("\n\t\t#group number=17");
}
}}
{
for(i=0;i<=5;i++)
{
if(*(fe+i)==atm)
{
gpn=18;
printf("\n\t\t NOBLE gases");
printf("\n\t\t#group number =18");
}
}}
switch(gpn){
case 13:
if (atm==5)
{
printf("\n\t\t#element name= boron");
printf("\n \t\t#element symbol=b");
printf("\n \t\t#semimetal in nature");
}
else if(atm==13)
{
printf("\n\t\t#element name= aluminum");
printf("\n\t\t#element symbol= al");
printf("\n\t\t#non metel in nature");
}
else if(atm==31)
{
printf("\n\t\t#element name= gallium");
printf("\n\t\t#elemant symbol= ga");
printf("\n\t\t#poor metal in nature");
}
else if(atm==49)
{
printf("\n\t\t#element name= indium");
printf("\n\t\t#element symbol= In");
printf("\n\t\t#poor metal in nature");
}
else if(atm==81)
{
printf("\n\t\t#element name= thalium");
printf("\n\t\t#element symbol= Tl");
printf("\n\t\t#poor metal in nature");
}
else
{
printf(" \n\t\t#elemet not in this group ");
}
goto y;
case 14:
if(atm==6)
{
printf("\n\t\t#element name= carbon");
printf("\n\t\t#element symbol= C");
printf("\n\t\t#nometal in nature");
}
else if(atm==14)
{ printf("\n\t\t#element name= silicon");
printf("\n\t\t#element symbol= Si");
printf("\n\t\t#semi metal in nature");
}
else if(atm==32)
{
printf("\n\t\t#element name= germanium");
printf("\n\t\t#element symbol= Ge");
printf("\n\t\t#semi metal in nature");
}
else if(atm==50)
{
printf("\n\t\t#element name= tin");
printf("\n\t\t#element symbol= Sn");
printf("\n\t\t#poor metal in nature");
}
else if(atm==82)
{
printf("\n\t\t#element name= lead");
printf("\n\t\t#element symbol= Pb");
printf("\n\t\t#poor metal in nature");
}
else
{
printf("\n\t\t#element not in this group");
}
goto y;
case 15:
if(atm==7)
{
printf("\n \t\t#element name= nitrogen");
printf("\n \t\t#element symbol=N");
printf("\n \t\t#non metal in nature");
}
else if(atm==33)
{
printf("\n\t\t#element name= arsenic");
printf("\n\t\t#element symbol= As");
printf("\n\t\t#metaloid in nature");
}
else if(atm==15)
{
printf("\n\t\t#element name= phosphorus");
printf("\n\t\t#element symbol= P");
printf("\n\t\t#non metal in nature");
}
else if(atm==51)
{
printf("\n\t\t#element name= Antimony");
printf("\n\t\t#element symbol= Sb");
printf("\n\t\t#metaloid in nature");
}
else if(atm==83)
{
printf("\n\t\t#element name= Bismuth");
printf("\n\t\t#element symbol= BI");
printf("\n\t\t#poor metal in nature");
}
else
{
printf("\n\t\t#element not in this group");
}
goto y;
case 16:
if(atm==8)
{
printf("\n\t\t#element name= Oxygen");
printf("\n\t\t#element symbol=O");
printf("\n\t\t#non metal in nature");
}
else if(atm==16)
{
printf("\n\t\t#element name= SULPHUR");
printf("\n\t\t#element symbol= S");
printf("\n\t\t#non metal in nature");
}
else if(atm==34)
{
printf("\n\t\t#element name= Selenium");
printf("\n\t\t#element symbol= Se");
printf("\n\t\t#non metal in nature");
}
else if(atm==52)
{
printf("\n\t\t#element name= tellunium");
printf("\n\t\t#element symbol= Te");
printf("\n\t\t3 metaloid in nature");
}
else if(atm==84)
{
printf("\n\t\t#element name= polonium");
printf("\n\t\t#element symbol= Po");
printf("\n\t\t#radioactive in nature");
}
else
{
printf("\n\t\t#element not in this group");
}
goto y;
case 17:
if(atm==9)
{
printf("\n\t\t#element name= flourine");
printf("\n\t\t#element symbol= F");
printf("\n\t\t#highly reactive in nature");
}
else if(atm==17)
{
printf("\n\t\t#element name= chlorine ");
printf("\n\t\t#element symbol= cl");
printf("\n\t\t#gas in nature");
}
else if(atm==35)
{
printf("\n\t\element name= bromine");
printf("\n element symbol= br");
printf("\n liquid in nature");
}
else if(atm==53)
{
printf("\n element name= iodine");
printf("\n element symbol= I");
printf("\n solid in nature");
}
else if(atm==85)
{
printf("\n element name= astatine");
printf("\n element symbol= AT");
printf("\n radioactive innature");
}
else
{
printf("\n not in this group ");
}
goto y;
case 18:
if(atm==2)
{
printf("\n element name= helium");
printf("\n element symbol= He");
printf("\n inert in nature");
}
else if(atm==10)
{
printf("\n element name= neon ");
printf("\n element symbol= Ne");
printf("\n inert in nature");
}
else if(atm==18)
{
printf("\n element name= argon");
printf("\n element symbol= Ar");
printf("\n inert in nature");
}
else if(atm==36)
{
printf("\n element name= krypton");
printf("\n element symbol= Kr");
printf("\n inert in nature");
}
else if(atm==54)
{
printf("\n element name= xenon");
printf("\n element symbol= Xe");
printf("\n inert innature");
}
else if(atm==86)
{
printf("\n element name= radon");
printf("\n element symbol= Rn");
printf("\n inert innature");
}
else
{
printf("\n not in this group ");
}
goto y;
default:
printf("\n\t\t\t wrong choice entered");
y: ;
printf("\n\n\tdo u want to continue....\n\n\ty-yes\n\n\tn->no\n\t\tenter (y or n):");
scanf("%s",&ch);
if(ch=='y')
goto z;
else
break;
}
getch();}}