L11_0627 pointer2 example code

1.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

const char* month_db[] = {
    "January",
    "Feburuary",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December",
    NULL};

int name2num(char* name)
{
    int i=0;
    for(i=0; month_db[i]; i++){
        if(!strcmp(month_db[i], name)) break;
    }
    
    return i+1;
}

const char* num2name(int num)
{
    return month_db[num-1];
}

void print(char strin[])
{
    int num = atoi(strin);
    if(0<num && num<=12){
        printf("%s\n", num2name(num));
    }else{
        num = name2num(strin);
        if(num<=12){
            printf("%d\n", num);
        }else{
            puts("入力が誤っています．");
        }
    }
}

int main()
{
    char strin[128];
    
    printf("input: ");
    scanf("%s", strin);
    print(strin);
    
    return 0;
}

2.cpp

#include <stdio.h>
#include <stdlib.h>

void load(char name[][128], int score[][3])
{
    const char fname[] = "as_test_result.csv";
    FILE* fp;
    if((fp=fopen(fname,"r"))==NULL){
        printf("Open Error¥n");
        exit(1);
    }
	
    int i = 0;
    for(; fscanf(fp, "%[^,],%d,%d,%d\n", name[i], &score[i][0], &score[i][1], &score[i][2]) != EOF;
        i++){
        // printf("%s, %d, %d, %d\n", name[i], score[i][0], score[i][1], score[i][2]);
    }
    score[i][0] = -1;
    fclose(fp);
}

void calc_sum(int score[][3], int sum[][2])
{
    int i = 0;
    for(i=0; score[i][0]+1; i++){
        sum[i][0] = (score[i][0] + score[i][1] + score[i][2]);
        sum[i][1] = i;
    }
    sum[i][0] = -1;
}

void write_csv(char name[][128], int sum[][2])
{
    const char fname[] = "test_rank.csv";
    FILE* fp;
    if((fp=fopen(fname,"w"))==NULL){
        printf("Open Error¥n");
        exit(1);
    }
    int total = 0;
    int i = 0;
    for(; sum[i][0]+1; i++){
        fprintf(fp, "%s,%d\n", name[sum[i][1]], sum[i][0]);
        total += sum[i][0];
    }
    fprintf(fp, "average,%.2f\n", 1.0*total/i);
    fclose(fp);
}

void sort(char name[][128], int sum[][2])
{
    for(int i=0; sum[i][0]+1; i++){
        for(int j=0; sum[j][0]+1; j++){
            if(sum[i][0] > sum[j][0]){
                int tmp = sum[i][1];
                sum[i][1] = sum[j][1];
                sum[j][1] = tmp;
                int tmp1 = sum[i][0];
                sum[i][0] = sum[j][0];
                sum[j][0] = tmp1;
            }
        }
    }
}

int main()
{
    char name[512][128];
    int score[512][3];
    int sum[512][2];

    load(name, score);
    calc_sum(score, sum);
    sort(name, sum);
    write_csv(name, sum);

    return 0;
}

3.cpp

#include <stdio.h>
#include <stdlib.h>

typedef double Matrix[4][4];

Matrix A = { 1, 5, 0, 0,
             2, 6, 0, 0,
             3, 7, 0, 111,
             4, 8, 0, 0 };

void write_csv()
{
    FILE* fp = NULL;
    const char fname[] = "myfile.bin";

    // 書き込みモードでバイナリファイルを開く
    if((fp=fopen(fname,"wb"))==NULL){
        printf("Open Error¥n");
        exit(1);
    }

    int n = 16;	//個数

    if(fwrite(&A, sizeof(double), n, fp)!= n){
        printf("write error¥n");
        exit(1);
    }
    fclose(fp);
}

void load(Matrix &m)
{
    // const char fname[] = "myfile.bin";
    const char fname[] = "as_matrix_image.bin";
    FILE* fp;
    if((fp=fopen(fname,"rb"))==NULL){
        printf("Open Error¥n");
        exit(1);
    }
    int n = 16;
    if(fread(m, sizeof(double), n, fp) != n){
        printf("read error¥n");
        exit(1);
    }
	
    fclose(fp);
}

int main()
{
    //write_csv();
    Matrix m;
    load(m);
    for(int i=0; i<4; i++){
        for(int j=0; j<4; j++){
            printf("%.1f, ", m[i][j]);
        }
        puts("");
    }
    return 0;
}