Introduction Gauss-siedel method to solve system of equations :undecided The code Code: #include <stdio.h> #include <conio.h> #include <math.h> #define N 100 #define ACC 0.000001 /************************************************************/ /***** Gauss-siedel method to solve system of equations *****/ /************************************************************/ void main() { float coeff[N][N+1]={{4,2,1,11},{3,5,3,22},{2,3,4,20},}; /* Co-efficient inputing variables */ float x[N]={0,0,0}; /* values of the variables i.e. x's */ int n=3; /* Number of equations */ int i,j; /* Loop variables */ float acc; /* Accuracy determining variable */ char ch; /* choice inputing variable */ do { printf("\nEnter the number of variables\n"); scanf("%d",&n); for(i=0;i<n;i++) { for(j=0;j<n+1;j++) { printf("\nEnter %d row %d col element\n",i+1,j+1); scanf("%f",&arr[i][j]); } } do { acc=coeff[0][n]; for(i=0;i<n;i++) { x[i]=coeff[i][n]; for(j=0;j<n;j++) { if(i==j) continue; x[i]=x[i]-coeff[i][j]*x[j]; } x[i]=x[i]/coeff[i][i]; } for(i=0;i<n;i++) acc=acc-coeff[0][i]*x[i]; }while(fabs(acc)>=ACC); for(i=0;i<n;i++) printf("%g\t",x[i]); printf("\nDo you wish to continue[y/n]\n"); fflush(stdin); scanf("%c",&ch); }while(ch=='Y' || ch=='Y'); getch(); }

Hi Nadr, You forgot to remove the background, it contains the default text :p But anyway, the article was very useful, thanx for that.