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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<string.h>
  4.  
  5. int main() 
  6. {
  7.     int i, j, T, a[3], d;
  8.     char Buffer[64], Expression[64], *ptr;
  9.     scanf("%d",&T);
  10.     gets(Buffer); // to ignore enter press after T input.
  11.  
  12.     while(T--)
  13.     {
  14.         gets(Buffer);
  15.         for(i=j=0; Buffer[i]!='='; i++) 
  16.         {
  17.             if(Buffer[i]==' ') continue;
  18.             if(Buffer[i]=='-' || Buffer[i]=='+')
  19.             {
  20.                 Expression[j++] = ' '; Expression[j++] = Buffer[i];
  21.             }
  22.             else Expression[j++] = Buffer[i];
  23.         }
  24.         Expression[j] = 0;
  25.         ptr = strtok(Expression, " ");
  26.         a[0] = a[1] = a[2] = 0;
  27.         while(ptr)
  28.         {
  29.             for(i=j=0; ptr[j]; j++)    i += (ptr[j]=='x');
  30.             a[i] = atoi(ptr);
  31.             if(!a[i]) a[i] = ptr[0]=='-'?-1:1;
  32.             ptr = strtok(0, " ");
  33.         }
  34.         d = a[1]*a[1] - 4*a[2]*a[0];
  35.         if(!d) puts("Equal roots.");
  36.         else if(d < 0) puts("Imaginary roots.");
  37.         else puts("Distinct real roots.");
  38. 	}
  39.   return 0;
  40. }
Success #stdin #stdout 0s 1836KB
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stdin
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2
x*x-2*x+1=0
2*x*x+5*x-3=0
stdout
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Equal roots.
Distinct real roots.
https://ideone.com/MEowFN
language:
C (gcc 8.3)
created:
10 years ago
visibility:
secret

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