[Linker error] undefined reference to `WinMain@16'
I am writing a phonebook programe,the programe is below, and an error [Linker error] undefined reference to `WinMain@16' is appear.
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
char name [500][500];
char tel [500][500];
char emailaddress [500][500];
void entername();
void sort ();
void searchbyname();
void searchbyphoneno();
void searchbyemailaddress();
void menu ();
void searchmethod ();
void backtomenu();
void end();
void add ();
void show ();
void entername () {
int input;
}
void searchbyname() {
int input;
printf("Enter name:\n\n\n\n\n\n\n\n\n\n");
}
void searchbyphoneno() {
int input;
printf("Enter phone no.:\n\n\n\n\n\n\n\n\n\n");
}
void searchbyemailaddress() {
int input;
printf("Enter email address:\n\n\n\n\n\n\n\n\n\n");
}
void searchmethod() {
int input,name;
printf("1. Search by name\n");
printf("2. Search by phone no.\n");
printf("3. Search by email address\n");
printf("--------------------------------------------------------------------------------");
do{
printf("Enter your choice: ");
scanf("%d", &input );
if ( input!=1 || input!=2 || input!=3 ) {
printf("Wrong input! Please input again!\n");
}
}while ( input<=0 || input>3 );
if ( input==1 ) {
system("CLS");
searchbyname();
backtomenu();
}
if ( input==2 ) {
system("CLS");
searchbyphoneno();
backtomenu();
}
if( input==3 ) {
system("CLS");
searchbyemailaddress();
backtomenu();
}
}
void backtomenu() {
int input;
printf("1. Back to menu\n");
printf("--------------------------------------------------------------------------------");
do{
printf("Enter your choice: ");
scanf("%d", &input );
if ( input!=1 ) {
printf("Wrong input! Please input again!\n");
}
}while ( input<1 || input>1 );
if ( input==1 ) {
system("CLS");
menu() ;
}
}
void end () {
system("CLS");
printf("\n\n\n\n\n");
printf(" {+-+-+-+-+-+End+-+-+-+-+-+}\n\n\n\n\n\n\n\n\n\n");
}
void menu () {
int input;
printf("*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~Address book~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*\n");
printf("1. Name list\n");
printf("2. Search\n");
printf("3. Add name and information\n");
printf("4. End\n");
printf("--------------------------------------------------------------------------------");
do{
printf("Enter your choice: ");
scanf("%d", &input );
if ( input!=1 || input!=2 || input!=3 || input!=4 || input!=5 ) {
printf("Wrong input! Please input again!\n");
}
}while ( input<=0 || input>5 );
if ( input==1 ) {
system("CLS");
show();
printf("\n");
backtomenu();
}
if ( input==2 ) {
system("CLS");
printf(" ~~~~~~~~~~~~~~~~~~~~Search~~~~~~~~~~~~~~~~~~~\n");
searchmethod ();
}
if( input==3 ) {
system("CLS");
add();
backtomenu();
}
if ( input==4 ) {
end ();
}
}
void add(){
int i;
char a='a';
FILE* f;
printf(" ~~~~~~~~~~~~~~~~~~~~Add name and information~~~~~~~~~~~~~~~~~~~~~\n");
printf("Enter name: ");
gets(name[1]);
gets(name[1]);
printf("Enter telephone number: ");
gets(tel[1]);
printf("Enter Email address: ");
gets(emailaddress[1]);
if((f=fopen("address.txt","a"))==NULL){
printf("Error!!");
}
else{
fputs(name[1],f);
fputc('\n', f);
fputs(tel[1],f);
fputc('\n', f);
fputs(emailaddress[1],f);
fputc('\n', f);
fclose(f);
sort ();
}
}
void show () {
char a='a';
FILE* f;
printf(" ~~~~~~~~~~~~~~~~~~~~Name list~~~~~~~~~~~~~~~~~~~~~\n");
if((f=fopen("address.txt","r"))==NULL){
printf("Error!!");
}
else{
do{
a=fgetc(f);
if( a != EOF)
printf("%c",a);
}while ( a!= EOF);
fclose(f);
}
}
void sort () {
char temp[500];
int i,j;
for(i=0; i< 500; i++) {
for(j=i; j<499;j++){
if(strcmp(name[j],name[j+1])==1){
strcpy(temp,name[j]);
strcpy(name[j],name[j+1]);
strcpy(name[j+1],temp);
}
}
}
int main () {
menu();
return 0;
system("PAUSE");
}
}
Please help if you can.Thz.
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
char name [500][500];
char tel [500][500];
char emailaddress [500][500];
void entername();
void sort ();
void searchbyname();
void searchbyphoneno();
void searchbyemailaddress();
void menu ();
void searchmethod ();
void backtomenu();
void end();
void add ();
void show ();
void entername () {
int input;
}
void searchbyname() {
int input;
printf("Enter name:\n\n\n\n\n\n\n\n\n\n");
}
void searchbyphoneno() {
int input;
printf("Enter phone no.:\n\n\n\n\n\n\n\n\n\n");
}
void searchbyemailaddress() {
int input;
printf("Enter email address:\n\n\n\n\n\n\n\n\n\n");
}
void searchmethod() {
int input,name;
printf("1. Search by name\n");
printf("2. Search by phone no.\n");
printf("3. Search by email address\n");
printf("--------------------------------------------------------------------------------");
do{
printf("Enter your choice: ");
scanf("%d", &input );
if ( input!=1 || input!=2 || input!=3 ) {
printf("Wrong input! Please input again!\n");
}
}while ( input<=0 || input>3 );
if ( input==1 ) {
system("CLS");
searchbyname();
backtomenu();
}
if ( input==2 ) {
system("CLS");
searchbyphoneno();
backtomenu();
}
if( input==3 ) {
system("CLS");
searchbyemailaddress();
backtomenu();
}
}
void backtomenu() {
int input;
printf("1. Back to menu\n");
printf("--------------------------------------------------------------------------------");
do{
printf("Enter your choice: ");
scanf("%d", &input );
if ( input!=1 ) {
printf("Wrong input! Please input again!\n");
}
}while ( input<1 || input>1 );
if ( input==1 ) {
system("CLS");
menu() ;
}
}
void end () {
system("CLS");
printf("\n\n\n\n\n");
printf(" {+-+-+-+-+-+End+-+-+-+-+-+}\n\n\n\n\n\n\n\n\n\n");
}
void menu () {
int input;
printf("*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~Address book~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*\n");
printf("1. Name list\n");
printf("2. Search\n");
printf("3. Add name and information\n");
printf("4. End\n");
printf("--------------------------------------------------------------------------------");
do{
printf("Enter your choice: ");
scanf("%d", &input );
if ( input!=1 || input!=2 || input!=3 || input!=4 || input!=5 ) {
printf("Wrong input! Please input again!\n");
}
}while ( input<=0 || input>5 );
if ( input==1 ) {
system("CLS");
show();
printf("\n");
backtomenu();
}
if ( input==2 ) {
system("CLS");
printf(" ~~~~~~~~~~~~~~~~~~~~Search~~~~~~~~~~~~~~~~~~~\n");
searchmethod ();
}
if( input==3 ) {
system("CLS");
add();
backtomenu();
}
if ( input==4 ) {
end ();
}
}
void add(){
int i;
char a='a';
FILE* f;
printf(" ~~~~~~~~~~~~~~~~~~~~Add name and information~~~~~~~~~~~~~~~~~~~~~\n");
printf("Enter name: ");
gets(name[1]);
gets(name[1]);
printf("Enter telephone number: ");
gets(tel[1]);
printf("Enter Email address: ");
gets(emailaddress[1]);
if((f=fopen("address.txt","a"))==NULL){
printf("Error!!");
}
else{
fputs(name[1],f);
fputc('\n', f);
fputs(tel[1],f);
fputc('\n', f);
fputs(emailaddress[1],f);
fputc('\n', f);
fclose(f);
sort ();
}
}
void show () {
char a='a';
FILE* f;
printf(" ~~~~~~~~~~~~~~~~~~~~Name list~~~~~~~~~~~~~~~~~~~~~\n");
if((f=fopen("address.txt","r"))==NULL){
printf("Error!!");
}
else{
do{
a=fgetc(f);
if( a != EOF)
printf("%c",a);
}while ( a!= EOF);
fclose(f);
}
}
void sort () {
char temp[500];
int i,j;
for(i=0; i< 500; i++) {
for(j=i; j<499;j++){
if(strcmp(name[j],name[j+1])==1){
strcpy(temp,name[j]);
strcpy(name[j],name[j+1]);
strcpy(name[j+1],temp);
}
}
}
int main () {
menu();
return 0;
system("PAUSE");
}
}
Please help if you can.Thz.
Last edited on
please copy and past your code from your compiler and but code tags around it please. That is barely readable
I am just a beginner, and I don't know how to copy and past the code from the compiler...
Last edited on
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I get no error. At least not in compiling. However, I tidied up your code a bit. As well, please use
It's worth mentioning that I can see a few other problems in the code, though. For instance, in
Oh, and
And you can simplify those lists of
That outputs
As well, the first four or so functions have
[code][/code] notation in order to make your code readable. |
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It's worth mentioning that I can see a few other problems in the code, though. For instance, in
menu(), your conditional statement allows values of input from 1 to 5, however, should input==5, there is no action after the do-while for input==5. Not to mention the fact that you could simply make the conditional statement if(input>4 || input < 1).Oh, and
system() is the Devil.And you can simplify those lists of
printf()'s to just one by using '\n' for a new line.printf("Hi\nMy username is Wasabi\nDid you know that's a Japanese spice based off horseradishes?");That outputs
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As well, the first four or so functions have
int input but do nothing with it. Hell, the first function as a whole does absolutely nothing.
the above compiles with no errors.
If you use a prototype which i recommend, put the function definition after the main which i have done
You also at times put too many {} braces
its a matter of preferance though. But pick one way and go with it.
In your code some times you did one thing and other times you did something else.
example
if(..........){
blah blh blah;
}
other times you would do this
if(.........)
blh blah blha; // i prefer this way to be honest
If you use a prototype which i recommend, put the function definition after the main which i have done
You also at times put too many {} braces
its a matter of preferance though. But pick one way and go with it.
In your code some times you did one thing and other times you did something else.
example
if(..........){
blah blh blah;
}
other times you would do this
if(.........)
blh blah blha; // i prefer this way to be honest
lol . yea I also didnt like the fact that you used ifs when you shouldve used if / else if etc
It's actually really important to know when to use each. A series of if's can all be true. If/Else If's can't. It becomes an either/or situation.
Big difference.
And I always get annoyed when I see
I try to delete the brackets whenever they aren't necessary, but I might have missed a few in my revision of this code.
Big difference.
And I always get annoyed when I see
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I try to delete the brackets whenever they aren't necessary, but I might have missed a few in my revision of this code.
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