Microsoft Word - no15.docx

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1 ex33.c /* */ #define IDLENGTH 7 /* */ #define MAX 100 /* */ /* */ struct student char idnumber[idlength + 1]; /* */ int math; /* () */ int english; /* () */ int japanese; /* () */ double average; /* */ ; /* */ void printstudent(struct student x); int main(void) struct student student[30]; /* */ int numstudent = 0; /* */ int i, j; while((numstudent < 1) (numstudent > MAX)) printf("(1-%d): ", MAX); scanf("%d", &numstudent); /* */ for(i = 0; i < numstudent; i++) printf("%d :\n : ", i + 1); scanf("%7s", student[i].idnumber); printf(": "); scanf("%d", &(student[i].math)); printf(": "); scanf("%d", &(student[i].english)); printf(": "); scanf("%d", &(student[i].japanese)); student[i].average = (double)(student[i].math + student[i].english + student[i].japanese) / 3;

2 /* */ printf("\n\n :\n"); for(i = 0; i < numstudent; i++) printstudent(student[i]); return (0); /* */ void printstudent(struct student x) printf("%10s: %3d %3d %3d %6.2f\n", x.idnumber, x.math, x.english, x.japanese, x.average); student (infomation) ex34.c /* */ /* */ struct fraction int sgn; /* sign */ int num; /* numerator */ int den; /* denominator */ ; /* */ struct fraction input_fraction(void); void print_fraction(struct fraction); struct fraction reduce_fraction(struct fraction); struct fraction add_fraction(struct fraction, struct fraction); int gcd(int, int); int main(void) struct fraction x, y, z; printf(" n"); x = input_fraction(); printf(" n"); y = input_fraction(); z = add_fraction(x, y); printf(" n"); print_fraction(z);

3 return(0); /* */ struct fraction input_fraction(void) struct fraction a; a.sgn = 1; printf(":"); scanf("%d", &(a.num)); if(a.num < 0) a.sgn = -a.sgn; a.num = -a.num; printf(":"); scanf("%d", &(a.den)); if(a.den < 0) a.sgn = -a.sgn; a.den = -a.den; return(a); /* */ void print_fraction(struct fraction a) if(a.den > 1) printf("%13d n", a.num); if(a.sgn < 0) printf("- "); /* */ else printf(" "); /* */ printf(" n"); /* */ printf("%13d n", a.den); else printf("%d n", a.sgn * a.num); /* */ struct fraction add_fraction(struct fraction x, struct fraction y) struct fraction z; z.sgn = 1; z.den = x.den * y.den; z.num = x.sgn * x.num * y.den + y.sgn * y.num * x.den; if(z.num < 0) z.sgn = -z.sgn; z.num = -z.num; return(reduce_fraction(z));

4 /* */ struct fraction reduce_fraction(struct fraction a) int m = gcd(a.num, a.den); a.num /= m; a.den /= m; return(a); /* */ int gcd(int p, int q) /* */ int r; for(r = p % q; r > 0; r = p % q) p = q; q = r; return (q);

5 : 12ff80 12ff81 int 5 12ff82 12ff83 12ff84 12ff85 12ff86 12ff87 double ff88 12ff89 12ff8A 12ff8B 12ff8C short int 5 12ff8D 12ff8E char 'x' :

6 ex35.c /* */ int main(void) int i; /* i int */ int *j; /* j int */ i = 5; /* i 5 */ j = &i; /* j i */ *j = 8; /* j 8 */ printf("i = %d\n", i); /* i */ printf("&i = %d\n", &i); /* i */ printf("&i = %x\n", &i); /* i (16 ) */ printf("sizeof(i)= %d\n", sizeof(i)); /* i */ printf("j = %d\n", j); /* j */ printf("*j = %d\n", *j); /* j */ printf("&j = %x\n", &j); /* j (16 ) */ printf("sizeof(j)= %d\n", sizeof(j)); /* j */ return(0); "&" "*" "*" "*" & j i

7 /* */ int main(void) int *j; /* j int */ *j = 8; /* j 8 printf("j = %d\n", j); /* j */ printf("*j = %d\n", *j); /* j */ return(0); j 8 j *; ex36.c /* */ /* */ void exchange (int *x, int *y); int main(void) int m = 5, n = 10; printf(": m = %d, n = %d\n", m, n);

$printf("exchange(&m, &n)\n"); exchange(&m, &n); /* & */ printf(": m = %d, n = %d\n", m, n); return(0); void exchange (int *x, int *y) /* */ /* x *x */$

8 printf("exchange(&m, &n)\n"); exchange(&m, &n); /* & */ printf(": m = %d, n = %d\n", m, n); return(0); void exchange (int *x, int *y) /* */ /* x *x */ /* y *y */ int t; /* */ t = *x; *x = *y; *y = t; /* x y */ *x, *y * &** & scanf '&' scanf & scanf : m 5 n 10 : x y t : scanf("", &,...); scanf("",,...);

Microsoft Word - no13.docx

Microsoft Word - no13.docx 4. 構造体 4.1 構造体とはたとえば分数をそのまま扱うときを考えてみましょう分数は分子と分母の 2 つの部分からなっていることから 2 つの変数を用いて表すことが必要ですここでは約分も行うこととします ex34.c /* 分数の計算 */ int gcd(int m, int n); int a_num, a_den; /* 分数 a */ int b_num, b_den; /* 分数