用c语言如何读入并使文本文件按某一列排序输出? c语言读取文件一列 文件以某列的数据按大小排列
\u5982\u4f55\u7528C\u8bed\u8a00\u5c06\u6587\u672c\u6587\u4ef6\u4e2d\u5185\u5bb9\u8bfb\u5165\u7a0b\u5e8f\uff0c\u5e76\u6309\u7167\u7b2c\u4e8c\u5217\u7684\u6570\u636e\u8fdb\u884c\u4ece\u5927\u5230\u5c0f\u6392\u5e8f\u3002
#include #include #include typedef struct stt{ char c1[9]; int c2; struct stt *next;}STT;void readFile(FILE *fp);void writeFile(FILE *fp);void printfSTT();//\u6253\u5370\u94fe\u8868void px();//\u5c06\u94fe\u8868\u6309c2\u964d\u5e8f\u6392\u5217STT *sttHead=NULL,*sttTail=NULL;int main(){ FILE *fp; if((fp=fopen("c:\\list.txt","rt+"))==NULL) { printf("can't open File!"); exit(1); } sttHead=(STT *)malloc(sizeof(STT)); sttHead->next=NULL; readFile(fp); printfSTT(); px(); printf("-----------\u6392\u5e8f\u540e-------------\n"); printfSTT(); writeFile(fp); return 0;}void px(){ STT *sttHeadSave1=sttHead,*sttHeadSave2=NULL,sttSave,*nextSave; while(sttHeadSave1->next!=NULL) { sttHeadSave2=sttHeadSave1->next; while(sttHeadSave2->next!=NULL) { if((sttHeadSave1->next->c2)next->c2)) { sttSave=*(sttHeadSave1->next); nextSave=sttHeadSave1->next->next; *(sttHeadSave1->next)=*(sttHeadSave2->next); sttHeadSave1->next->next=nextSave; nextSave=sttHeadSave2->next->next; *(sttHeadSave2->next)=sttSave; sttHeadSave2->next->next=nextSave; } sttHeadSave2=sttHeadSave2->next; } sttHeadSave1=sttHeadSave1->next; }}void printfSTT(){ STT *sttHeadSave=sttHead; printf("-----------\u6253\u5370\u94fe\u8868-------------\n"); while(sttHeadSave->next!=NULL) { printf("%s %d\n",sttHeadSave->next->c1,sttHeadSave->next->c2); sttHeadSave=sttHeadSave->next; }}void readFile(FILE *fp){ int c2; char c1[9]; STT *sttNew; fseek(fp,0,SEEK_SET); printf("-----------\u8bfb\u53d6\u6587\u4ef6\u5230\u94fe\u8868-------------\n"); while(fscanf(fp,"%s %d",c1,&c2)!=-1) { sttNew=(STT *)malloc(sizeof(STT)); sttNew->next=NULL; strcpy(sttNew->c1,c1); sttNew->c2=c2; if(sttHead->next==NULL) sttHead->next=sttNew; else sttTail->next=sttNew; sttTail=sttNew; }}void writeFile(FILE *fp){ fseek(fp, 0, SEEK_SET); fseek(fp, 0, SEEK_END); printf("-----------\u5f00\u59cb\u5199\u5165\u6587\u4ef6-------------\n"); STT *sttHeadSave=sttHead; fprintf(fp,"%s","-----------\u6392\u5e8f\u540e-------------\n"); while(sttHeadSave->next!=NULL) { fprintf(fp,"%s %d%s",sttHeadSave->next->c1,sttHeadSave->next->c2,"\n"); sttHeadSave=sttHeadSave->next; } printf("------------\u5199\u5165\u5b8c\u6210-------------\n");}
1.\u7528fgets\u51fd\u6570\u53ef\u4ee5\u8bfb\u53d6\u6587\u4ef6\u4e2d\u67d0\u884c\u7684\u6570\u636e\uff0c\u67d0\u5217\u6570\u636e\u5c31\u5fc5\u987b\u4e00\u4e2a\u4e00\u4e2a\u8bfb\u5165\u6bcf\u884c\u7684\u7b2c\u51e0\u4e2a\u5b57\u7b26\uff0c\u518d\u5b58\u5165\u5230\u4e00\u4e2a\u5b57\u7b26\u4e32\u5f53\u4e2d\u30022.\u4f8b\u7a0b\uff1a
#include#includevoid main(){ char a[100],b[100],c[100]; int i=3,j=4,k=0; //\u7b2c\u4e09\u884c\uff0c\u7b2c\u56db\u5217 FILE *fp = fopen("data.txt","r"); while(fgets(c,100,fp)){ //\u8bfb\u5165\u6bcf\u884c\u6570\u636e i--; if(i==0) strcpy(a,c); //\u8bfb\u5230\u7b2c\u4e09\u884c\u6570\u636e b[k++]=c[j-1]; //\u628a\u6bcf\u884c\u7684\u90a3\u5217\u5b57\u7b26\u62f7\u5230b\u4e2d } b[k]=0; printf("\u7b2c%d\u884c\u6570\u636e\uff1a%s\n",i,a); printf("\u7b2c%d\u5217\u6570\u636e\uff1a%s\n",j,b); fclose(fp);}3.\u9047\u5230\u6b64\u95ee\u9898\uff0c\u5982\u679c\u6b64\u529f\u80fd\u4e0d\u662f\u5e94\u7528\u8f6f\u4ef6\u7684\u4e00\u90e8\u5206\uff0c\u5219\u53ef\u4ee5\u901a\u8fc7\u6279\u5904\u7406\u7684for\u5faa\u73af\u547d\u4ee4\u6765\u8fdb\u884c\u63d0\u53d6\uff0c\u76f8\u5bf9\u6bd4\u4f7f\u7528c\u8bed\u8a00\u6548\u7387\u3002
使用文件操作函数打开文件，读取信息，进行排序，重新写入并覆盖原文件。
例程：
#include <stdio.h>
#include <stdlib.h>
int comp(const void* a,const void* b){
return *(int*)a-*(int*)b;
}
int main(){
FILE *p;//文件指针
int i,j,a[1000];
p = fopen("文件名称", "r");//第一个字符串是你文件路径,路径中的\要写成\\,文件名必须带后缀
for(i=0;fscanf(p,"%d",a+i)!= EOF;i++);//EOF为文件尾(end of file),读取文本中的数据
qsort(a,i,sizeof(int),comp); //由小到大排序,比较方式由comp函数指定。
fclose(p);
p = fopen("文件名称", "w");//以写入方式重新打开
for(j=0;j<i;j++) fprintf(p,"%d ",a[j]);//重新输入排序后的数据
fclose(p)
return 0;
}
你可以酱紫:
# include <stdio.h>
int main(void)
{
FILE *p;//文件指针
char ch[1000];//1000你可以改滴~
int i = 0;
p = fopen("", "r");//第一个字符串是你文件路径,路径中的\要写成\\,文件名必须带后缀
if (!p)//如果文件打开失败,fopen返回NULL(0)
{
printf("打开文件失败!
");
exit(-1);
}
while(ch[i-1] != EOF || i=1000)//EOF为文件尾(end of file)
{
ch[i] = getc(p);//向p指向的流中读一个字符,并将文件指针后移一位,返回值为读到的字符的ASCII码
i++;
}
//下面你就可以对数组处理了
//或者你可以处理一行,读一行.但是我不知道你想咋处理,就这样写了
return 0;
}
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