4.14从文本文件中读入数据

1、本节主题：从文本文件中读入数据文件的操作读/写指 定 格 式以字符为单位从文件读入写到文件中fprintf（文件指针，格式字符串，输出表列)fscanf（文件指针，格式字符串，输入表列)int fgetc(FILE *fp)int fputc(int ch, FILE *fp)例：编程序，实现文本文件的复制#include #include int main()FILE *fpin, *fpout; char c;if (fpin=fopen(source.txt, r)=NULL)printf(Source file cannot open!); exit(0);if (fpout=fope

2、n(target.txt, w)=NULL)printf(Target file cannot open!); exit(0);while(c=fgetc(fpin)!=EOF)fputc(c, fpout); printf(Finish copy!n); fclose(fpin); fclose(fpout);return 0;source.txttarget.txt应用：大奖赛计分，将计算结果数据存入文件#include #include int main()FILE *fp;if (fp=fopen(record.txt, w)=NULL) printf(Target file cann

3、ot open!); exit(0);int judgeNum, singerNum, j, s; float mark, sum, aver, max, min;scanf(%d %d, &judgeNum, &singerNum); fprintf(fp, No.t); for(j=1;j=judgeNum;j+)fprintf(fp, %dt, j); fprintf(fp, MaxtMintavern); s=1;fclose(fp); return 0;while(s=singerNum) sum=0; max=0; min=10; j=1;fprintf(fp, %dt, s);d

4、o scanf(%f,&mark);fprintf(fp, %.2ft, mark);sum+=mark; if(maxmark) min=mark; j+;while(j=judgeNum);aver = (sum-max-min)/(judgeNum-2);fprintf(fp, %.2ft%.2ft%.2fn, max, min, aver);s+;应用：大奖赛计分，从文件中读取数据，并将结果存入文件#include #include int main()FILE *fp1, *fp2;if (fp1=fopen(score.dat, r)=NULL)printf(Target file

5、 cannot open!); exit(0);if (fp2=fopen(result.csv, w)=NULL)printf(Target file cannot open!); exit(0);int judgeNum=11, j, s;float mark, sum, aver, max, min;fprintf(fp2, No.,Max,Min,avern);fclose(fp1); fclose(fp2); return 0;while(fscanf(fp1, %d, &s)=1)sum=0; max=0;min=10;fprintf(fp2, %d, s);printf(calculate %d .n, s); j=1;dofscanf(fp1, %f,&mark);sum+=mark; if(maxmark) min=mark; j+;while(j=jud