高斯消元法

1.高斯列主消元法

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define N 10 
#define EPS 1e-10 //定义EPS为1乘以10的-10次方 
void main()
{float A[N][N+1]; //定义zengguang矩阵   
     
    float sum=0;   
    int i,j,k;   
   int n;
    int flag=1;   
    
     
    while(flag) 
    { 
        printf("请输入系数矩阵的大小："); 
        scanf("%d", &n); 
        if(n>N){ 
            printf("矩阵过大！\n"); 
            continue; 
        } 
        flag=0; 
    } 
    printf("请输入系数矩阵值：\n"); 
    for(i=0; i<n; i++) 
    { 
        for(j=0; j<n; j++) 

        { 
            printf("a[%d][%d]: ", i, j); 
            scanf("%f", &A[i][j]); 
        } 
    } 
   
    /*显示原始矩阵*/ 
    printf("\n原始矩阵：\n");   
    for(i=0; i<n; i++)   
    {   
        for(j=0; j<n; j++)   
            printf("%0.3f ",A[i][j]);   
        printf("\n");   
    }   
    printf("\n\n");   
    
    int x[N];
    int Pr,t,total;
    for(k=1;k<N;k++)
    {
        Pr=k-1;
        for(i=k;i<N;i++)
        {
            if(abs(A[i][k-1])>abs(A[Pr][k-1]))
            {
                Pr=i;
            }
        }//End For i
        if(abs(A[i][k-1])<EPS)
        {