西北农林科技大学 c语言上机 实习8答案.docx

西北农林科技大学c语言上机实习8答案

第一篇：西北农林科技大学c语言上机实习8答案1.文本文件中字符个数统计#include#includeintmain(void){charch,filename[200];intcount=0;FILE*fp;scanf(“%s”,filename);if((fp=fopen(filename,“r”))==NULL){printf(“Fileopenerror!n”);exit(1);}while((ch=fgetc(fp))!=EOF){count++;}printf(“%dn”,count);if(fclose(fp)){printf(“Filecloseerror!n”);exit(1);}return0;}2.文件中数据的排序#include#includeintmain(void){inta[10],temp=0,i=0,j=0,k=0;charfilename1[80],filename2[80];FILE*fp1,*fp2;scanf(“%s”,filename1);scanf(“%s”,filename2);if((fp1=fopen(filename1,“rb”))==NULL){printf(“Inputfileopenerror!n”);exit(1);}if((fp2=fopen(filename2,“wb”))==NULL){printf(“Outputfilecreateerror!n”);exit(1);}for(i=0;i{fread(&a[i],sizeof(int),1,fp1);/*读出数据*/}for(i=0;i{k=i;for(j=i+1;jif(a[k]>a[j])k=j;if(k!=i){temp=a[k];a[k]=a[i];a[i]=temp;}}for(i=0;i/*{fwrite(&a[i],sizeof(int),1,fp2);}if(fclose(fp1)){printf(“Inputfilecloseerror!n”);exit(1);}if(fclose(fp2)){printf(“Outputfilecloseerror!n”);exit(1);}/*验证结果的代码，请不要改动*/if((fp1=fopen(filename2,“rb”))==NULL){printf(“Resultfileopenerror!n”);exit(1);}/*排序*/写入数据*/for(i=0;i{fread(&a[i],sizeof(int),1,fp1);/*读出数据*/}if(fclose(fp1)){printf(“Resultfilecloseerror!n”);exit(1);}for(i=0;iprintf(“%d”,a[i]);printf(“%dn”,a[i]);return0;}3二进制数据文件/#include#includeintmain(void){inta[10],temp=0,i=0,j=0,k=0;charfilename1[80],filename2[80];FILE*fp1,*fp2;scanf(“%s”,filename1);scanf(“%s”,filename2);if((fp1=fopen(filename1,“r”))==NULL){printf(“Inputfileopenerror!n”);exit(1);}if((fp2=fopen(filename2,“wb”))==NULL){printf(“Outputfileopenerror!n”);exit(1);}for(i=0;i{fscanf(fp1,“%d”,&a[i]);fwrite(&a[i],sizeof(int),1,fp2);}if(fclose(fp1)){printf(“Inputfilecloseerror!n”);exit(1);}if(fclose(fp2)){printf(“Outputfilecloseerror!n”);exit(1);}if((fp1=fopen(filename2,“rb”))==NULL){printf(“Resultfileopenerror!n”);exit(1);}for(i=0;i{fread(&a[i],sizeof(int),1,fp1);}if(fclose(fp1)){printf(“Resultfilecloseerror!n”);exit(1);}for(i=0;iprintf(“%d”,a[i]);printf(“%dn”,a[i]);return0;}4.比较2个文本文件的内容#include#includeintmain(void){inti=1,flag=0;ch