I am new to C programming which's why I am confused with its syntax.
Question: A Sudoku puzzle uses a 9 × 9 grid in which each column and row, as well as
each of the nine 3 × 3 subgrids, must contain all of the digits 1 ? ? ? 9. Figure
4.26 presents an example of a valid Sudoku puzzle. This project consists of
designing a multithreaded application that determines whether the solution
to a Sudoku puzzle is valid.
There are several different ways of multithreading this application. The one
suggested strategy is to create threads that check the following criteria:
? A thread to check that each column contains the digits 1 through 9
? A thread to check that each row contains the digits 1 through 9
#include <stdlib.h>
int i,j,m,b,k;
void main()
{
int a[9][9]={1,2,3,4,5,6,7,8,9,
4,5,6,7,8,9,1,2,3,
7,8,9,1,2,3,4,5,6,
2,3,4,5,6,7,8,9,1,
5,6,7,8,9,1,2,3,4,
8,9,1,2,3,4,5,6,7,
3,4,5,6,7,8,9,1,2,
6,7,8,9,1,2,3,4,5,
9,1,2,3,4,5,6,7,8};
if(rowcheck(a)==1 && colcheck(a)==1 & cubecheck(a)==1)
{
printf("Success");
}
else{
printf("Failed");
}
}
int rowcheck(int a[9][9])
{
int c[10]={0};
for(i=0;i<9;i++)
{
for(j=0;j<9;j++)
{
c[a[i][j]]++;
}
for(k=1;k<=9;k++)
if(c[k]!=1)
{
printf("The value %d came %d times in %d row
",k,c[k],i+1);
return 0;
}
for(k=1;k<=9;k++)
c[k]=0;
}
return 1;
}
int colcheck(int a[9][9])
{
int c[10]={0};
for(i=0;i<9;i++)
{
for(j=0;j<9;j++)
{
c[a[i][j]]++;
}
for(k=1;k<=9;k++)
if(c[k]!=1)
{
printf("The value %d came %d times in %d column
",k,c[k],i+1);
return 0;
}
for(k=1;k<=9;k++)
c[k]=0;
}
return 1;
}
int cubecheck(int a[9][9])
{
int c[10]={0},count=0;
for(m=0;m<9;m+=3)
{
for(b=0;b<9;b+=3)
{
for(i=m;i<m+3;i++)
{
for(j=b;j<b+3;j++)
{
c[a[i][j]]++;
}
}
count++;
for(k=1;k<=9;k++)
if(c[k]!=1)
{
printf("The value %d came %d times in %d box
",k,c[k],count);
return 0;
}
for(k=1;k<=9;k++)
c[k]=0;
}
}
return 1;
}```
I am getting this error plz help.
```proj1.c: In function ‘main’:
proj1.c:18:8: warning: implicit declaration of function ‘rowcheck’ [-Wimplicit-function-declaration]
if(rowcheck(a)==1 && colcheck(a)==1 & cubecheck(a)==1)
^~~~~~~~
proj1.c:18:26: warning: implicit declaration of function ‘colcheck’ [-Wimplicit-function-declaration]
if(rowcheck(a)==1 && colcheck(a)==1 & cubecheck(a)==1)
^~~~~~~~
proj1.c:18:43: warning: implicit declaration of function ‘cubecheck’ [-Wimplicit-function-declaration]
if(rowcheck(a)==1 && colcheck(a)==1 & cubecheck(a)==1)
^~~~~~~~~
proj1.c: At top level:
proj1.c:136:1: error: expected identifier or ‘(’ before ‘}’ token
}```
^
question from:
https://stackoverflow.com/questions/65651668/warning-implicit-declaration-of-function-colcheck-wimplicit-function-declar