第一題 (magic.c)
#include <stdio.h>
#include <stdlib.h>
int question1()
{
int matA[10][10] = {0};
int mat3[3][3] =
{ {7,11,6},
{ 7, 8,9},
{10, 5,9}
};
int i,j;
printf("What this matrix's magic number?\n");
for (i = 0;i < 3;i++)
{
for (j = 0;j < 3;++j)
{
matA[i][j]=mat3[i][j];
printf("%3d",matA[i][j]);
}
printf("\n");
}
printf("This matrix's magic is %d.\n",magic(matA,3));
system("pause");
return 0;
}
int magic(int A[][10], int n)
{
int sum=0,i,j,tmp;
for (i = 0;i < n;++i)
{
sum+=A[0][i];
}
for (i = 0;i < n;++i)
{
tmp = 0;
for (j = 0;j < n;++j)
{
tmp += A[i][j];
}
if (tmp != sum) return 0;
tmp = 0;
for (j = 0;j < n;++j)
{
tmp += A[j][i];
}
if (tmp != sum) return 0;
}
tmp=0;
for (i = 0;i < n;++i)
{
tmp += A[i][i];
}
if (tmp != sum) return 0;
tmp=0;
for (i = 0;i < n;++i)
{
tmp += A[n-i-1][i];
}
if (tmp != sum) return 0;
return sum;
}
第二題 (MinMaxAvg.c)
#include <stdio.h>
#include <stdlib.h>
void MinMaxAvg(int values[], int n, int* min, int* max, double* avg);
int question2()
{
int v[] = {0,11,22,33,44,55,66,77,88,99};
int min,max,i;
double avg;
MinMaxAvg(v,10,&min,&max,&avg);
printf("What is the min,max and avg in this Array?\n");
for (i = 0;i < 10;++i)
{
printf("%3d",v[i]);
}
printf("\nmin= %d , max= %d , avg = %lf\n",min,max,avg);
system("pause");
return 0;
}
void MinMaxAvg(int values[], int n, int* min, int* max, double* avg)
{
int i,sum = 0,_min = values[0],_max = values[0];
double _avg;
for (i = 0;i < n;++i)
{
_min = (_min > values[i])?values[i]:_min;
_max = (_max < values[i])?values[i]:_max;
sum += values[i];
}
_avg = (double)sum / n;
*min = _min;
*max = _max;
*avg = _avg;
}
第三題 (StringCompare.c)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int question3()
{
char string1[100] = {0};
char string2[100] = {0};
printf("Enter string1:");
scanf("%s",string1);
printf("Enter string2:");
scanf("%s",string2);
printf("%s ",string1);
switch (strcmp(string1,string2))
{
case 1:
printf(">");
break;
case 0:
printf("=");
break;
case -1:
printf("<");
break;
}
printf(" %s\n",string2);
system("pause");
return 0;
}
第四題 (Convert.c)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char* NumToStr(long n);
char* Convert(const long n);
int question4()
{
long input;
printf("Enter any 1-9 digit number: ");
scanf("%ld",&input);
printf("%s\n",Convert(input));
system("pause");
return 0;
}
char* Convert(const long n)
{
char tmp[200] = "";
if (n>=0)
{
if (n <= 20)
{
return NumToStr(n);
}
else if (n < 100)
{
if (n % 10 == 0)
{
return NumToStr(n);
}
else
{
strcat(tmp,NumToStr(n/10*10));
strcat(tmp,"-");
strcat(tmp,NumToStr(n%10));
return tmp;
}
}
else if (n < 1000)
{
if (n % 100 == 0)
{
strcat(tmp,NumToStr(n/100));
strcat(tmp," ");
strcat(tmp,NumToStr(100));
return tmp;
}
else
{
strcat(tmp,NumToStr(n/100));
strcat(tmp," ");
strcat(tmp,NumToStr(100));
strcat(tmp," ");
strcat(tmp,Convert(n%100));
return tmp;
}
}
else if (n < 1000000)
{
if (n % 1000 == 0)
{
strcat(tmp,Convert(n/1000));
strcat(tmp," ");
strcat(tmp,NumToStr(1000));
return tmp;
}
else
{
strcat(tmp,Convert(n/1000));
strcat(tmp," ");
strcat(tmp,NumToStr(1000));
strcat(tmp," ");
strcat(tmp,Convert(n%1000));
return tmp;
}
}
else if (n >= 1000000)
{
if (n % 1000000 == 0)
{
strcat(tmp,Convert(n/1000000));
strcat(tmp," ");
strcat(tmp,NumToStr(1000000));
return tmp;
}
else
{
strcat(tmp,Convert(n/1000000));
strcat(tmp," ");
strcat(tmp,NumToStr(1000000));
strcat(tmp," ");
strcat(tmp,Convert(n%1000000));
return tmp;
}
}
}
else
{
return "I don't know";
}
}
char* NumToStr(const long n)
{
switch (n)
{
case 0:
return "zero";
break;
case 1:
return "one";
break;
case 2:
return "two";
break;
case 3:
return "three";
break;
case 4:
return "four";
break;
case 5:
return "five";
break;
case 6:
return "six";
break;
case 7:
return "seven";
break;
case 8:
return "eight";
break;
case 9:
return "nine";
break;
case 10:
return "ten";
break;
case 11:
return "eleven";
break;
case 12:
return "twelve";
break;
case 13:
return "thirteen";
break;
case 14:
return "forteen";
break;
case 15:
return "fifteen";
break;
case 16:
return "sixteen";
break;
case 17:
return "seventeen";
break;
case 18:
return "eighteen";
break;
case 19:
return "nineteen";
break;
case 20:
return "twenty";
break;
case 30:
return "thirty";
break;
case 40:
return "forty";
break;
case 50:
return "fifty";
break;
case 60:
return "sixty";
break;
case 70:
return "seventy";
break;
case 80:
return "eighty";
break;
case 90:
return "ninety";
break;
case 100:
return "hundred";
break;
case 1000:
return "thousand";
break;
case 1000000:
return "million";
break;
}
}
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