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fp=fopen(\ if(fp==NULL)

{ printf(\

return; } i=0;

while(i<10&&!feof(fp))

{ printf(\ i++; }

}

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#include \

void ctfb(FILE *fp) {

int i; float x;

for(i=0;i<10;i++) { scanf(\

fwrite(&x,sizeof(float),1,fp); } }

void fbtc(FILE *fp) {

float x;

rewind (fp);

fread(&x,sizeof(float),1,fp); while(!feof(fp)) { printf(\

fread(&x,sizeof(float),1,fp); } }

void updata(FILE *fp,int n,float x)

{ fseek(fp,(long)(n-1)*sizeof(float),0); fwrite(&x,sizeof(float),1,fp);

} main() { FILE *fp;

int n=4; float x;

if((fp=fopen(\ { printf(\ exit(0); }

}

ctfb(fp); fbtc(fp); scanf(%updata(fp,n,x); fbtc(fp); fclose(fp);

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