２．データ構造

 

（１）   年月日から曜日を求める

 

#include "stdafx.h"

// ツェラー(Zeller)の公式

int WeekDay(int Y, int M, int D)

{       int YY=Y; int MM=M;

        if (M<3){YY=Y-1; MM=M+12;}

        return (YY +(YY/4)-(YY/100)+(YY/400)+(13*MM + 8)/5+D) % 7;

}

int main(int argc, char* argv[])

{       int Y,M,D;

        printf("Year : "); scanf("%d",&Y);

        printf("Month: "); scanf("%d",&M);

        printf("Day  : "); scanf("%d",&D);

        int R=WeekDay(Y,M,D);

char X[7][4]={"日","月","火","水","木","金","土"};

        printf("\n%04d/%02d/%02dは, %s曜日です。\n\n",Y,M,D,X[R]);    

        return 0;

}

 

 

 

 

 

 

 

 

 

（２）   構造体の例（体重の判定）

 

#include "stdafx.h"

struct physique_data   /*体格データ*/

{   char Name[20]; float Weight,Height;

};

void strcopy(char a[],char b[])

{   int i;

        for(i=0;a[i] !=0;i++) b[i]=a[i];

        b[i]='\0';

}

int main(int argc, char* argv[])

{       physique_data X;char S[10];

        printf("氏名 : "); scanf("%s", &X.Name);

        printf("体重 : "); scanf("%f", &X.Weight);

        printf("身長 : "); scanf("%f", &X.Height);

        double S_Weight=X.Height * X.Height * 22/10000;

        double Fat=(X.Weight - S_Weight)/S_Weight;

        if(Fat>=0.1) strcopy("太りすぎ",S);

        else if(Fat<=-0.1) strcopy("やせすぎ",S);else strcopy("標準",S);

        printf("\n%sさんは，%sです。\n標準体重　=%6.1f  肥満度 = %6.1f\n",

X.Name, S,S_Weight, Fat);

        printf("\n");

        return 0;

}

 

 

 

 （３）   構造体の例（体重の平均）

 

#include "stdafx.h"

#define SIZE_OF_ARRAY 8

struct physique_data   /*体格データ*/

{

        char Name[30];

        float Weight,Height;

} dt[]={

        {"佐　多　憲　二",65,171},

        {"村　瀬　　　真",57,169},

        {"大　田　和　夫",60,168},

        {"北　田　洋　一",73,172},

        {"志　村　康　司",62,170},

        {"別　府　拓　哉",59,165},

        {"相　馬　修　一",68,176},

        {"木　田　裕　也",61,167}

 

};

 

int main(int argc, char* argv[])

{   int i;

        printf("\n");

        for(i=0;i<SIZE_OF_ARRAY;i++){

                printf("   %s : 体重 = %5.1f kg  身長 = %5.1f cm\n",

                        dt[i].Name, dt[i].Weight, dt[i].Height);

        }

        double T1=0,T2=0;

        for(i=0;i<SIZE_OF_ARRAY;i++)    {

                        T1 += dt[i].Weight;T2 += dt[i].Height;

        }

        T1 /= SIZE_OF_ARRAY; T2 /= SIZE_OF_ARRAY;

        printf("\n    平均体重 = %6.2f kg  平均身長 = %6.2f cm\n\n",T1, T2);

        return 0;

}

 

 

 

 

 

 

 

 

（４）   構造体の例（複素数）

 

#include "stdafx.h"

#include "stdlib.h"
#include "math.h"

struct Complex

{

        double R;   // 実部

        double I;   // 虚部

};

struct Complex setComplex(double R,double I)

{

        Complex X;  X.R=R; X.I=I;
        return X;

}

struct Complex addComplex(struct Complex a, struct Complex b)

{

        Complex X;  X.R = a.R+b.R; X.I=a.I+b.I;
        return X;

}

struct Complex subComplex(struct Complex a, struct Complex b)

{

        Complex X;  X.R = a.R - b.R; X.I = a.I - b.I;
        return X;

}

void printComplex(struct Complex a)

{

        if(fabs(a.I)<0.0001) printf("%7.4f",a.R);
        else if(fabs(a.R)<0.0001) printf("%7.4f j",a.I);
        else if(a.I<0) printf("%7.4f - %7.4f j", a.R, -a.I);
        else printf("%7.4f + %7.4f j",a.R, a.I);

}

int main(int argc, char* argv[])

{

    Complex X1 = setComplex(1.0,2.0);
    Complex X2 = setComplex(3.0,4.0);
    Complex X3 = addComplex(X1, X2);
    Complex X4 = subComplex(X1, X2);
    printf("\n\n");
    printf("   X1 = ");printComplex(X1);
    printf("   X2 = ");printComplex(X2);
    printf("\n\n");
    printf("   X3 = ");printComplex(X3);
    printf("   X4 = ");printComplex(X4);
    printf("\n\n");
    return 0;

}