The problem is that, there are weird numbers in the matrix.Code:#include <stdio.h> typedef int mat[10][10]; void input(mat matr) { int x,y; scanf("%d %d",&x,&y); while(x!=-1&&y!=-1) { matr[x][y]==1; scanf("%d %d",&x,&y); } } void print(mat matr) { int i,j; for(i=0;i<10;i++) for(j=0;j<10;j++) printf("%d",matr[i][j]); } void zer(mat matr) { int i,j; for(i=0;i<10;i++) for(j=0;j<10;j++) if(!matr[i][j]) matr[i][j]=0; } void killcell(mat matr) { int countneib=0; int i,j; for(i=0;i<10;i++) for(j=0;j<10;j++) if(matr[i][j]==1) { if(matr[i-1][j]==1) countneib++; if(matr[i+1][j]==1) countneib++; if(matr[i][j+1]==1) countneib++; if(matr[i][j-1]==1) countneib++; if(matr[i+1][j+1]==1) countneib++; if(matr[i+1][j-1]==1) countneib++; if(matr[i-1][j-1]==1) countneib++; if(matr[i-1][j+1]==1) countneib++; } if(countneib>3) matr[i][j]=0; } void createcell(mat matr) { int countneib=0; int i,j; for(i=0;i<10;i++) for(j=0;j<10;j++) if(matr[i][j]==0) { if(matr[i-1][j]==1) countneib++; if(matr[i+1][j]==1) countneib++; if(matr[i][j+1]==1) countneib++; if(matr[i][j-1]==1) countneib++; if(matr[i+1][j+1]==1) countneib++; if(matr[i+1][j-1]==1) countneib++; if(matr[i-1][j-1]==1) countneib++; if(matr[i-1][j+1]==1) countneib++; } if(countneib==3) matr[i][j]=1; } int main () { char choice; int i,j; mat matr; input(matr); zer(matr); print(matr); scanf("%c",&choice); while(choice!='n') { killcell(matr); createcell(matr); print(matr); scanf("%c",&choice); } return 0; }

Thanks