贺老师教学链接 C语言及程序设计初步 本课讲解
编程序，实现文本文件的复制 #include <stdio.h> #include <stdlib.h> int main() { FILE *fpin, *fpout; char c; if ((fpin=fopen("source.txt", "r"))==NULL) { printf("Source file cannot open!"); exit(0); } if ((fpout=fopen("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; } 应用：大奖赛计分，将计算结果数据存入文件 #include <stdio.h> #include <stdlib.h> int main() { FILE *fp; if ((fp=fopen("record.txt", "w"))==NULL) { printf("Target file cannot 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, "%d\t", j); fprintf(fp, "Max\tMin\taver\n"); s=1; while(s<=singerNum) { sum=0; max=0; min=10; j=1; fprintf(fp, "%d\t", s); do { scanf("%f",&mark); fprintf(fp, "%.2f\t", mark); sum+=mark; if(max<mark) max=mark; if(min>mark) min=mark; j++; } while(j<=judgeNum); aver = (sum-max-min)/(judgeNum-2); fprintf(fp, "%.2f\t%.2f\t%.2f\n", max, min, aver); s++; } fclose(fp); return 0; } 应用：大奖赛计分，从文件中读取数据，并将结果存入文件 #include <stdio.h> #include <stdlib.h> int main() { FILE *fp1, *fp2; if ((fp1=fopen("score.dat", "r"))==NULL) { printf("Target file 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,aver\n"); while(fscanf(fp1, "%d", &s)==1) { sum=0; max=0; min=10; fprintf(fp2, "%d,", s); printf("calculate %d ...\n", s); j=1; do { fscanf(fp1, "%f",&mark); sum+=mark; if(max<mark) max=mark; if(min>mark) min=mark; j++; } while(j<=judgeNum); aver = (sum-max-min)/(judgeNum-2); fprintf(fp2, "%.2f,%.2f,%.2f\n", max, min, aver); } fclose(fp1); fclose(fp2); return 0; }用下面的数据，建立文件score.dat1 7.11 8.52 8.58 8.81 7.79 7.53 8.95 8.97 8.95 7.26 8.722 7.95 7.46 8.19 9.9 7.11 7.77 8.5 7.88 8.58 8.66 7.153 7.75 8.75 8.63 8.54 8.17 8.34 8.37 8.97 7.87 8.25 8.224 7.92 7.75 7.11 7.88 8.83 8.58 7.5 7.14 7.23 7.61 7.165 7.47 7.77 8.97 7.11 7.64 7.05 8.57 8.35 8.11 7.06 8.356 8.99 8.11 7.43 8.93 7.75 7.99 7.76 8.35 7.16 8.27 7.577 9.47 7.66 8.71 7.42 9.17 7.68 7.76 7.65 8.36 7.07 7.18 8.42 8.31 8.93 7.51 8.64 8.45 8.75 8.82 7.58 8.59 7.889 7.32 8.2 7.03 9 8.39 8.02 8 8.74 7.88 7.27 8.2610 7.8 7.6 8.72 8.8 8.39 7.09 8.42 8.34 8.91 8.4 7.3811 8.69 7.18 7.2 8.99 7.12 8.57 7.27 8.99 8.49 7.15 8.0512 8.1 7.49 7.46 7.86 8.53 8.66 8.29 8.96 8.41 8.72 8.413 7.87 8.06 7.34 7.21 8.3 7.42 7.95 9.07 7.59 8.16 8.9914 7.23 7.43 8.83 7.33 7.25 8.76 8.12 7.65 8.94 8.05 7.2815 7.08 7.39 7.13 7.41 8 8.08 7.26 7.52 8.55 8.54 8.6816 7.4 7.91 8.52 7.92 7.7 8.81 7.74 8.27 7.51 7.84 7.3717 7.15 7.88 7.31 7.16 8.39 8.73 8.09 9.7 8.67 7.66 7.118 8.68 7.79 7.74 7.78 7.69 8.13 8.18 8.94 7.39 8.67 8.3819 7.73 7.71 9.64 8.84 8.97 8.12 8.99 7.41 8.53 8.93 7.5920 8.74 7.58 8.54 8.81 7.31 7.21 7.39 8.83 9.17 8.22 7.4821 8.52 8.56 8.68 7.97 7.06 7.24 7.29 8.9 8.82 7.74 9.322 7.59 8.82 7.93 8.73 8.88 8.86 7.29 7.79 7.1 8.67 8.7923 7.38 7.89 8.01 7.2 8.25 7.82 8.75 7.47 8.44 7.95 8.7924 7.25 8.2 8.18 8.7 7.85 8.53 8.93 8.03 8.65 8.71 7.2825 8.66 8.31 8.49 8.62 7.59 7.03 7.75 8.63 7.09 9.72 7.8626 9.08 7.31 8.03 9.3 8 7.26 8.09 7.52 8.22 7.66 8.99
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