目录

（1）求解有几位数

 (2)分别输出每一位数字

(3)按逆序输出各位数字

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（1）求解有几位数

#include<stdio.h>unsigned int GetFigures(int n)
{unsigned int figures = 0; while(n!=0){n /= 10;figures++;}return figures;
}int main()
{printf("%d\n",GetFigures(12345));printf("%d\n",GetFigures(0));printf("%d\n",GetFigures(-12345));return 0;
}

 (2)分别输出每一位数字

#include<stdio.h>
#include<math.h>
unsigned int GetFigures(int n)
{unsigned int figures = 0; while(n!=0){n /= 10;figures++;}return figures;
}
void PrintOrder(int n)
{unsigned char figures = GetFigures(n);                         /*  获取n的位数                      */int power = (int)pow((float)10,(float)figures-1);              /*  获取n最高位数字需要除模的数字    */int temp;if (0 == figures)                                              /*  n为0                             */{printf("0\n");}if (n < 0)                                                     /*  n小于0先打印“-”再处理数值      */{n = -n;printf("-");}while(power != 0){temp = n / power;n %= power;power /= 10;printf("%d",temp);}printf("\n");
}int main()
{PrintOrder(1234);return 0;
}

 

(3)按逆序输出各位数字

#include<stdio.h>
void PrintReverse(int n)
{int temp;if (0 == n)                                                    /*  n为0                             */{printf("0\n");}if (n < 0)                                                     /*  n小于0先打印“-”再处理数值      */{n = -n;printf("-");}while(n != 0){temp = n % 10;    n /= 10;printf("%d",temp);}printf("\n");
}int main()
{PrintReverse(1234);return 0;
}