#include <stdio.h>
#include <math.h>

float a[10][20];
int n,m,m1,v,i,j,k;
float d,c,p,q;

void main(void){

while( printf(" n = "), scanf("%d",&n)!=0){  
    m = n + 1;
    m1 = n + 1;
   
   printf("　係数を%d", n * m1 );
   printf(" 個入力してください\n");
  for (i = 1;i<= n;i++){
	  printf("*****第%d",i);
	   printf("式*****\n");
	   for (j = 1;j<= m1;j++){
         scanf("%f",&a[i][j]);
	   }
   }
 //*****************************
  for (i = 1;i<= n;i++){
	   for (j = 1;j<= m1;j++){
         printf("%8.2f",a[i][j]);
	   }
	   printf("\n");
   }
       printf("-------------------------------\n");
//*****************************
   printf("修正　行? ");
   scanf("%d",&i); 	
   printf("修正　列? ");
   scanf("%d",&j); 
   printf("%f",a[i][j]);
   printf(" ⇒　");
   scanf("%f",&a[i][j]);
    for (i = 1;i<= n;i++){
	   for (j = 1;j<= m1;j++){
         printf("%8.2f",a[i][j]);
	   }
	   printf("\n");
   }
       printf("-------------------------------\n");
//*****************************
printf("Go OK?   Input any Integer ");
scanf("%d",&v);
 d = 1;
 for (k = 1;k<= n;k++){
     p = a[k][k];
	 if (fabs(p) < 0.01){
         if (a[k][m] = 0 )
           printf("    行列式＝0   解不定\n");
         else
           printf("    行列式＝0   解なし\n");
         
   //      MsgBox "第" & k & "列のピボットが０"
   //      exit ;        
       }
   for (i = 1;i<=n;i++){
	   if (i != k){
         c = a[i][k] / p;
	     for (j = k;j<= m;j++){        
		  a[i][j] = a[i][j] - c * a[k][j];
		 }
	   }
   } 
  d = d * a[k][k];
}
//*****************************
 printf( "行列式＝ %f\n" , d);
 for( i = 1;i<= n;i++){
      q = a[i][i];
	  for (j = 1;j<= m;j++){
         a[i][ j] = a[i][j] / q;
	  }
 } 
//*****************************
  for (i = 1;i<= n;i++){
	   for (j = 1;j<= m1;j++){
         printf("%8.2f",a[i][j]);
	   }
	   printf("\n");
   }
       printf("-------------------------------\n");
}
}