#include "string.h"
#include "ctype.h"
#include "stdio.h"
search(char pd[])
{FILE *fp;
int time=0,i=0,j=0,add[80],k=0,m;
char *ch,
str[900];
m=strlen(pd);
if((fp=fopen("haha.txt","r"))==NULL)
{
printf("Cannot open this file\n");
exit(0);
}
for(;!feof(fp);i++)
{
str[i]=fgetc(fp);
if(tolower(str[i])==tolower(pd[k]))
{k++;
if(k==m)
if(!isalpha(i-m)&&!isalpha((str[i++]=fgetc(fp))))
{
time++;
add[j]=i-m+1;
j++;
k=0;
}
else k=0;
}
}
if(time)
{
printf("The time is:%d\n",time);
printf("The adders is:\n");
for(i=0;i<j;i++)
printf("%5d",add[i]);
if(i%5==0)
printf("\n");
getch();
fclose(fp);
}
else
printf("Sorry!Cannot find the word(^_^)");
}
main()
{
char pd[10],choose='y';
int flag=1;
while(flag)
{printf("In put the word you want to seqarch:");
scanf("%s",pd);
search(strlwr(pd));
printf("\nWould you want to continue?(Y/N):");
getchar();
scanf("%c",&choose);
if((tolower(choose))=='n')
flag=0;
else flag=1;
}
printf("Thanks for your using!Bye-bye!\n");
getch();
}
標簽：
學生專用
上傳時間：
2016-12-29
上傳用戶：767483511
# include<stdio.h>
# include<math.h>
# define N 3
main(){
float NF2(float *x,float *y);
float A[N][N]={{10,-1,-2},{-1,10,-2},{-1,-1,5}};
float b[N]={7.2,8.3,4.2},sum=0;
float x[N]= {0,0,0},y[N]={0},x0[N]={};
int i,j,n=0;
for(i=0;i<N;i++)
{
x[i]=x0[i];
}
for(n=0;;n++){
//計算下一個值
for(i=0;i<N;i++){
sum=0;
for(j=0;j<N;j++){
if(j!=i){
sum=sum+A[i][j]*x[j];
}
}
y[i]=(1/A[i][i])*(b[i]-sum);
//sum=0;
}
//判斷誤差大小
if(NF2(x,y)>0.01){
for(i=0;i<N;i++){
x[i]=y[i];
}
}
else
break;
}
printf("經過%d次雅可比迭代解出方程組的解：\n",n+1);
for(i=0;i<N;i++){
printf("%f ",y[i]);
}
}
//求兩個向量差的二范數函數
float NF2(float *x,float *y){
int i;
float z,sum1=0;
for(i=0;i<N;i++){
sum1=sum1+pow(y[i]-x[i],2);
}
z=sqrt(sum1);
return z;
}
標簽：
C語言
編寫
迭代
上傳時間：
2019-10-13
上傳用戶：大萌萌撒
