编程环境Visual Studio 2017
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#include <stdio.h> #include <stdlib.h> #include <ctype.h> #include <math.h> // practice 1 double min_rewrite(double x, double y) { return (x < y ? x : y); } void p9_1(void) { double number1 = 0.0; double number2 = 0.0; printf("Enter the first number:"); scanf_s("%lf", &number1); getchar(); printf("Enter the second number:"); scanf_s("%lf", &number2); getchar(); printf("The min number of %lf and %lf is %lf", number1, number2, min_rewrite(number1, number2)); return; } // practice 2 void chline(char *ch, int i, int j) { int m = 0; int n = 0; int tmp = 0; while ((*(ch + tmp)) != '\0') { if (m == i - 1) { break; } if ('\n' == (*(ch + tmp))) { m++; } tmp++; } for (n = 0; n < j; n++) { if (n == j - 1) { putchar(ch[tmp]); } tmp++; } } void p9_2(void) { int i = 0; int j = 0; char ch = 0; char *words = "hello world!\nThis is the bulteaful world!\nLearn to program in c language!\nc language is a nice language!"; printf("Please enter the row:"); scanf_s("%d", &i); getchar(); printf("Please enter the column:"); scanf_s("%d", &j); getchar(); printf("The character of %d row %d column is ", i, j); chline(words, i, j); printf("\n"); return; } // practice 3 void print_n_char(char ch, int repeat_time, int repeat_row) { for (int i = 0; i < repeat_row; i++) { for (int j = 0; j < repeat_time; j++) { putchar(ch); } putchar('\n'); } return; } void p9_3() { int i = 0; int j = 0; char ch = 0; printf("Enter the character you want to print:"); ch = getchar(); getchar(); printf("Enter the number of times to print:"); scanf_s("%d", &i); getchar(); printf("Enter the number of lines to print:"); scanf_s("%d", &j); getchar(); print_n_char(ch, i, j); return; } // practice 4 double harmonic_avg(double number1, double number2) { double reciprocal1 = 1 / number1; double reciprocal2 = 1 / number2; double sum = reciprocal1 + reciprocal2; double sum_avg = sum / 2; return (1 / sum_avg); } void p9_4(void) { double number1 = 0.0; double number2 = 0.0; double result = 0.0; printf("Ener the first double number:"); scanf_s("%lf", &number1); getchar(); printf("Enter the second double number:"); scanf_s("%lf", &number2); getchar(); result = harmonic_avg(number1, number2); printf("The harmonic average of %lf and %lf is %lf\n", number1, number2, result); return; } // practice 5 void larger_of(double *x, double *y) { if (*x > *y) { *y = *x; } else { *x = *y; } } void p9_5(void) { double number1 = 0.0; double number2 = 0.0; printf("Enter the first double number:"); scanf_s("%lf", &number1); getchar(); printf("Enter the second double number:"); scanf_s("%lf", &number2); getchar(); printf("Before larger_of, the two numbers are %lf and %lf\n", number1, number2); larger_of(&number1, &number2); printf("After larger_of, the two number are %lf and %lf\n", number1, number2); return; } // practice 6 void rank_three_double(double *number1, double *number2, double *number3) { double tmp = 0.0; if (*number1 > *number2) { tmp = *number1; *number1 = *number2; *number2 = tmp; } if (*number1 > *number3) { tmp = *number1; *number1 = *number3; *number3 = tmp; } if (*number2 > *number3) { tmp = *number2; *number2 = *number3; *number3 = tmp; } return; } void p9_6(void) { double number1 = 0.0; double number2 = 0.0; double number3 = 0.0; printf("Enter the first double number:"); scanf_s("%lf", &number1); getchar(); printf("Enter the second double number:"); scanf_s("%lf", &number2); getchar(); printf("Enter the third double number:"); scanf_s("%lf", &number3); getchar(); printf("Before rank, the three double number are: %lf, %lf and %lf\n", number1, number2, number3); rank_three_double(&number1, &number2, &number3); printf("After rank, the three double number are: %lf, %lf and %lf\n", number1, number2, number3); return; } // practice 7 // 不好模拟文件末尾，所以用#代替文件末尾 int judge_alpha(char ch) { if (isalpha(ch)) { return ch - 'a' + 1; } else { return -1; } } void p9_7(void) { char ch = 0; int result = 0; printf("Enter the character:(# to quit):"); while ((ch = getchar()) != '#') { if ('\n' == ch) { continue; } int jud = judge_alpha(ch); if (-1 == jud) { printf("%c is not a alpha.\n", ch); } else { printf("%c:%d\n", ch, jud); } printf("Enter the next character:(# to quit):"); } return; } // practice 8 double pow_rewrite(double base, double index) { if (index > 0) { return pow(base, index); } if (0 == index) { if (0 == base) { printf("The base number is 0 is not defined!\n"); } return 1; } if (index < 0) { double tmp = pow(base, -index); return (1 / tmp); } } void p9_8(void) { double base = 0.0; double index = 0.0; double result = 0.0; printf("Enter the base number:"); scanf_s("%lf", &base); getchar(); printf("Enter the index number:"); scanf_s("%lf", &index); getchar(); result = pow_rewrite(base, index); printf("base number: %lf, index number: %lf, the result: %lf\n", base, index, result); return; } // practice 9 double pow_recursive(double base, double index) { if (index > 0) { index--; return (base * pow_recursive(base, index)); } if (0 == index) { if (base == 0) { printf("The base number is 0 is not defined!\n"); } return 1; } if (index < 0) { index++; double tmp = 1 / base; return (tmp * pow_recursive(base, index)); } } void p9_9(void) { double base = 0.0; double index = 0.0; double result = 0.0; printf("Enter the base number:"); scanf_s("%lf", &base); getchar(); printf("Enter the index number:"); scanf_s("%lf", &index); getchar(); result = pow_recursive(base, index); printf("base number: %lf, index number: %lf, the result: %lf\n", base, index, result); return; } // practice 10 void to_base_n(unsigned long n, int base) { int r = 0; r = n % base; if (n >= base) { to_base_n(n / base, base); } putchar(('0' + r)); return; } void p9_10(void) { unsigned long number = 0; int base = 0; printf("Enter the value that needs to be converted:"); scanf_s("%ld", &number); getchar(); printf("Enter the value of the base number:"); scanf_s("%d", &base); getchar(); printf("The result is: "); to_base_n(number, base); putchar('\n'); return; } // practice 11 void Fibonacci(unsigned int n) { int fib1 = 1; int fib2 = 1; printf("%d, %d", fib1, fib2); for (size_t i = 0; (i = (fib1 + fib2)) < n;) { printf(", %d", i); fib1 = fib2; fib2 = i; } putchar('\n'); return; } void p9_11(void) { unsigned long num = 0; printf("Enter the larger number of fabonicci:"); scanf_s("%ld", &num); getchar(); Fibonacci(num); return; } int main(int argc, char **argv) { p9_11(); while (getchar()) { } return; } |
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第八题
你看下是不是有问题？
我看不懂，我编译器结果输出不正确。
递归这玩意该怎么理解啊？
第八题我这边看这没有问题啊；递归理解可以简单理解为在一个函数里面自己调用自己，然后在合适的时候通过return来借宿递归
:exclaim:博主大大= =，能不能和我解释一下11题的代码最后int main（int argc, char **argv）这个函数的意义。感觉摸不到头脑，删掉这段结果也无误。如果能抽空解惑的话，万分感谢
呃兄弟，这是c程序的main函数啊
= =之前没弄懂 char**是什么hh。现在已经明白了hh
博主 请问一下为什么第一题要用getchar（）
新手求教 万分感谢！！！
博主 请问第一题为什么要用getchar（）？？
新手求教 万分感谢
用来读取缓冲里面的回车键
第八题复制你的代码编译有警告，warning: control reaches end of non-void function。 位置是子函数的最后一行，是编译器的问题吗?我用的codeblock
这是因为编译器检查到pow_rewrite子函数里面并不是每个执行路径里面都有返回值，所以才报的warning，你可以将if(index > 0)这个判断语句去掉，然后将return pow(base, index)作为默认的return语句
第二题 第三题 我怎么感觉是同一个意思，楼主能解释下区别么 这两题
楼主，你这个函数有问题，运行起来不能完全显示出来，如果输入n等于6，显示前6个Fibonacci。
结果只能显示：1 1 2 3 5，因为条件fib1 + fib2 等于8 ,判别式fib1 + fib2 < n 此时n等于6已经不成立。
// practice 11
void Fibonacci(unsigned int n)
{
int fib1 = 1;
int fib2 = 1;
printf("%d, %d", fib1, fib2);
for (size_t i = 0; (i = (fib1 + fib2)) < n;)
{
printf(", %d", i);
fib1 = fib2;
fib2 = i;
}
putchar('\n');
return;
}
应改为：
void Fibonacci(unsigned int n)
{
int fib1 = 1;
int fib2 = 1;
int sum =0;
printf("%d %d", fib1, fib2);
for(int i = 2; i < n; i++)
{
sum = fib1 + fib2;
printf(" %d", sum);
fib1 = fib2;
fib2 = sum;
}
return ;
}
这样的话就能完全达到题目要求。
博主 你第九题用递归处理幂函数的递归部分，在Xcode中提示这个bug"Control may reach end of non-void function" 请问如何解决呢
博主，第七题中，如果是大写的话，题目要求返回的是跟大写一样的值，是不是应该多加一个大小写的判断？
直接return tolower(ch)-'a'+1;就可以了。
答主递归写错了
请问第11题主函数为什么要写while语句呢？