1.
#include <stdio.h>
#include <math.h>
void main()
{
double a, b, c, s, area;
printf("三角形三边长(a, b, c):");
scanf("%lf, %lf, %lf", &a, &b, &c);
s = (a + b + c) / 2;
area = sqrt(s * (s -a) * (s - b) * (s - c));
printf("三角形面积:%lf\n", area);
}
2.
#include <stdio.h>
void main()
{
double a, b;
double add, sub, pro, div;
printf("输入两个数(以空格分隔):");
scanf("%lf%lf", &a, &b);
add = a + b;
sub = a - b;
pro = a * b;
div = a / b;
printf("%lf + %lf = %lf\n", a, b, add);
printf("%lf - %lf = %lf\n", a, b, sub);
printf("%lf * %lf = %lf\n", a, b, pro);
printf("%lf / %lf = %lf\n", a, b, div);
}
3.
#include <stdio.h>
#include <math.h>
int isPrime(int n)
{
int i;
int k = (int)sqrt(n);
for(i=2; i<=k; i++)
if(n % i == 0)
return 0;
return 1;
}
void main()
{
int i;
long sum = 0;
for(i=100; i<=230; i++)
if(isPrime(i) == 1)
sum += i;
printf("素数和:%ld\n", sum);
}
4.
#include <stdio.h>
void main()
{
int score;
printf("成绩:");
scanf("%d", &score);
if(score < 0 || score > 100)
printf("error");
else if(score >= 90)
printf("excellent");
else if(score >= 80)
printf("good");
else if(score >= 70)
printf("general");
else if(score >= 60)
printf("pass");
else
printf("no pass");
}
5.
#include <stdio.h>
void main()
{
int a, b, c;
printf("输入三个数(以空格分隔):");
scanf("%d%d%d", &a, &b, &c);
if(a > b)
if(a > c)
if(b > c)
printf("%d %d %d\n", c, b, a);
else
printf("%d %d %d\n", b, c, a);
else
printf("%d %d %d\n", b, a, c);
else
if(b > c)
if(a > c)
printf("%d %d %d\n", c, a, b);
else
printf("%d %d %d\n", a, c, b);
else
printf("%d %d %d\n", a, b, c);
}
6.
#include <stdio.h>
void main()
{
int n;
for(n=100; n<=200; n++)
if(n%3==2 && n%5==3 && n%7==2)
printf("%d\n", n);
}
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