#include <stdio.h>
int main()
{
char ch ;
scanf("%c", &ch);
if(ch >= 'A' && ch <= 'Z') ch = ch + 32;
else if(ch >= 'a' && ch <= 'z') ch = ch - 32;
printf("%c\n", ch);
return 0;
}
#include <stdio.h>
#include <math.h>
int main()
{
float a, b, c;
float s, area;
scanf("%f,%f,%f" , &a, &b ,&c);
if(a + b > c && a + c > b && b + c > a)
{
s = (a + b + c) / 2;
area = sqrt(s * (s - a) * (s - b) * (s - c));
printf("三角形的面积为:%f\n", area);
if(a == b && b == c)
printf("等边三角形\n");
else if((a = b && a != c) || (a = c && a != b) || (b = c && b != a) )
printf("等腰三角形\n");
else if((a * a + b * b == c * c) || (a * a + c * c == b * b) || (c * c + b * b == a * a))
printf("直角三角形\n");
else printf("一般三角形\n");
}
else printf("不能组成三角形\n");
return 0;
}
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