部分习题代码丢失，需要请联系博主。
编译环境：Visual Studio 2017
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include<string.h>
#define da 0.1
#define de 0.05
//9. out(double a, double b);
int main(void)
//1
{
char a[26];
int i;
for (i = 0; i < 26; i++)
{
a[i] = 'a' + i;
printf("%c\t",a[i]);
}
system("pause");
return 0;
}
//2
{
int row, num;
for (row = 1; row < 6; row++)
{
for (num = 0; num < row; num++)
printf("$");
printf("\n");
}
system("pause");
return 0;
}
//3
{
int i,j;
for (i = 1; i < 7; i++)
{
for (j=0;j<i;j++)
{
printf("%c", 'f'-j);
}
printf("\n");
}
system("pause");
return 0;
}
//4
{
int i, j, k;
k = 0;
for (i = 1; i < 7; i++)
{
for (j = 0; j<i; j++)
{
k++;
printf("%c", 'a'+k-1);
}
printf("\n");
}
system("pause");
return 0;
}
//5
{
int i, bl, br, l, r, n, p,k;
char a;
printf("please input capital letter:\n");
scanf("%s", &a);
n = a - 64;
printf("%d\n", n);
for (i = 1; i <= n; i++)
{
for (bl =1; bl <= n-i; bl++)
printf(" ");
for (l = n - i + 1, p = 0; l <= n, p < i; l++, p++)
{
//k = p;
printf("%c", 'a' + p);
}
for (r = n+1; r <= n + i - 1; r++,p--)
printf("%c",'a'+p-2);
for (br = n+i; br <=2*n-1 ; br++)
printf(" ");
printf("\n");
}
system("pause");
return 0;
}
//6
{
int min, max, inp;
printf("please input the min and the max:\n");
scanf("%d %d", &min, &max);
for (inp = min; inp <= max; inp++)
printf("%d\t%d\t%d\n", inp, (int)pow(inp,2), (int)pow(inp, 3));
//关于pow的问题：https://blog.csdn.net/xiaohan13916830/article/details/198767
system("pause");
return 0;
}
//7
{
int length;
char word[20];
printf("please input a word:\n");
scanf("%s", word);
length = strlen(word);
for (; length >= 0; length--)
printf("%c", word[length-1]);//最后一个是空字符！
system("pause");
return 0;
}
//8
{
double a, b;
printf("please input two float numbers:\n");
while ((scanf("%lf %lf", &a, &b)) == 2)
printf("%lf\n", (a - b) /( a * b));
system("pause");
return 0;
}
//9
{
double a, b;
printf("please input two float numbers:\n");
while ((scanf("%lf %lf", &a, &b)) == 2)
out(a, b);
system("pause");
return 0;
}
out(double a, double b)
{
printf("%lf\n", (a - b) / (a * b));
}
//10
{
long lower, upper,sum, a;//注意范围！
sum = 0;
printf("enter lower and upper integer limits:");
scanf("%ld%ld", &lower, &upper);
while (lower<upper)
{
a = lower;
for (;lower<=upper;lower++)
sum = sum + (int)pow(lower, 2);
printf("the sum of the squares from %ld to %ld is %ld\n",
(int)pow(a, 2), (int)pow(upper, 2), sum);
printf("enter lower and upper integer limits:");
scanf("%ld%ld", &lower, &upper);
}
system("pause");
return 0;
}
//11
{
int a[20],i;
for (i=0;i<8;i++)
scanf("%d",&a[i]);
for (i = 7; i>=0; i--)
printf("%d", a[i]);
system("pause");
return 0;
}
//12
{
double a=0, b=0, sum;
long i,n;
printf("pleas input times:");
scanf("%d", &n);
while (n>0)
{
a = b = 0;
for (i = 1; i <= n; i++)
{
a = a + 1.0 / (double)i;
b = b + (int)pow(-1, i+1)*1.0 / (double)i;
}
sum = a + b;
printf("a+b=%lf\n",sum);
printf("a=%lf\n", a);
printf("b=%lf\n", b);
printf("pleas input times:");
scanf("%d", &n);
}
system("pause");
return 0;
}
//13
{
int num[8],i;
for (i = 0; i < 8; i++)
num[i] = (int)pow(2, i);
i = i - 1;
do
{
printf("%d\n", num[i]);
i--;
} while (i>=0);
system("pause");
return 0;
}
//14
{
double a[8], b[8];
int i;
for (i = 0; i < 8; i++)
{
scanf("%lf", &a[i]);
if (i==0)
b[i] = a[0];
else
b[i] = b[i - 1] + a[i];
printf("%2lf\t", a[i]);
}
printf("\n");
for (i = 0; i < 8; i++)
printf("%lf\t", b[i]);
system("pause");
return 0;
}
//15
{
char word[10];
int i;
for (i = 0; i < 10; i++)
{
scanf("%c", &word[i]);
if (word[i] == '\n')
break;
}
for (; i >= 1; i--)
printf("%c",word[i-1]);
system("pause");
return 0;
}
//16
{
double da=100,de=100;
int i;
for (i = 1; de <= da; i++)
{
da = 100 + 100 * da*i;
de = de + de * de;
printf("da=%lf,de=%lf,i=%d\n", da, de,i);
}
printf("da=%lf,de=%lf,i=%d", da, de, i);
system("pause");
return 0;
}
//17
{
double yu=100.0;
int i;
for (i = 1; yu > 0; i++)
{
yu = (yu + yu * 0.08) - 10;
printf("yu=%lf\ti=%d\n", yu, i);
}
system("pause");
return 0;
}
//18
{
int a = 5, i;
for (i = 1; a < 150; i++)
{
a = (a - i) * 2;
printf("a=%d\ti=%d\n", a, i);
}
system("pause");
return 0;
}
{
double b;
long a,i;
while (scanf("%ld", &i)==1)
{
b = 0;
for (a = 1; a <= i; a++)
b = b + 1.0 / a;
printf("b=%lf\n", b);
printf("st=%lf\n", 0.577 + log(i));
}
system("pause");
return 0;
}