cpp1.cpp

由c语言编写的解非线性方程

#include<stdio.h>
void main()
{
    FILE *fp1;FILE *fp2;FILE *fp3;
	float  A[5][5],B[5],aaa;
    char  ch1[10],ch2[10];
	int i,j;
    printf("请输入系数矩阵文件名：");
  scanf("%s",ch1);
  printf("请输入方程X矩阵文件名：");
  scanf("%s",ch2);

 if((fp1=fopen(ch1,"r"))==NULL)
  {
    printf("can not open file!\n");
    return;
  }
/*打开增广矩阵数据文件*/

if((fp2=fopen(ch2,"r"))==NULL)
  {
    printf("can not open file!\n");
    return ;
}
fp3=fopen("b.txt","w");
for(i=0;i<5;i++)
{
	aaa=0;
	  for(j=0;j<5;j++)
     {
       fscanf(fp1,"%f",&A[i][j]);fscanf(fp2,"%f",&B[j]);//printf("%8.4f,%8.4f",A[i][j]);
	   aaa=aaa+A[i][j]*B[j];
     }
      printf("%8.4f",aaa);
	  fprintf(fp3,"%10.4f",aaa);
}
   fclose(fp1);fclose(fp2);fclose(fp3);
}