title: Advanced Scientific Calculator using functions in c
body: <p>I Tried to make an advanced calculator, but it's having some run time error and i am not able to figure it out.. code works... but with some run time error. I am trying to make it work, but not matter what i try, the error exists. i have even tried using switch case.</p>
  
  <pre><code> #include&lt;stdio.h&gt;
   #include&lt;math.h&gt;
   #define PI 3.14159265
   float sine(float x);
   float cosine(float x);
   float tangent(float x);
   float exponent(float x);
   float logb10(float x);
   float logb2(float x);
   float power(float x, float y);
   float fmodu(float x, float y);
  
  int main()
  {
    int n;
    float x,y,z;
    do
    {
    printf ("MENU\n1.SIN\n2.COS\n3.TAN\n4.EXP\n5.LOG10\n6.LOG2\n7.POW\n8.FMOD\n9.Exit\n");
    printf("Enter your choice:\n");
    scanf("%d", &amp;n);
  
  if(n==1)
  {
    printf("Enter the degree:\n");
    scanf("%f", &amp;x);
    z=sine(x);
    printf("sin(%.2f) = %.2f\n",x,z);
  }
  
  else  if(n==2)
  {
    printf("Enter the degree:\n");
    scanf("%f", &amp;x);
    z=cosine(x);
    printf("cos(%.2f) = %.2f\n",x,z);
  }
  
    else  if(n==3)
  {
    printf("Enter the degree:\n");
    scanf("%f", &amp;x);
    z=tangent(x);
    printf("tan(%.2f) = %.2f\n",x,z);
  }
  
     else if(n==4)
  {
    printf("Enter the power of e:\n");
    scanf("%f", &amp;x);
    z=exponent(x);
    printf("e^(%.2f) = %.2f\n",x,z);
  }
  
   else  if(n==5)
  {
    printf("Enter the number to find log10:\n");
    scanf("%f", &amp;x);
    z=logb10(x);
    printf("logb10(%.2f) = %.2f\n",x,z);
  }
  
   else if(n==6)
  {
    printf("Enter the number to find log2:\n");
    scanf("%f", &amp;x);
    z=logb2(x);
    printf("log2(%.2f) = %.2f\n",x,z);
  }
  
    else   if(n==7)
  {
    printf("Enter the base:\n");
    scanf("%f", &amp;x);
    printf("Enter the exponent:\n");
    scanf("%f", &amp;y);
    z=power(x,y);
    printf("%.2fd^%.2f = %.2f\n", x,y,z);
  }
  
     else  if(n==8)
  {
    printf("Enter the number:\n");
    scanf("%f", &amp;x);
    printf("Enter the modulor:\n");
    scanf("%f", &amp;y);
    z=fmodu(x,y);
    printf("The floating point remainder of %.2f / %.2f = %.2f\n",x,y,z);
     }
    }while(n!=9);
     return 0;
    }
  
    float sine(float x)
    {
    return sin(x*PI/180);
    }
  
    float cosine(float x)
     {
     return cos(x*PI/180);
      }
      float tangent(float x)
     {
      return tan(x*PI/180);
      }
  
       float exponent(float x)
      {
    return exp(x);
      }
  
     float logb10(float x)
       {
    return log10(x);
     }
  
      float logb2(float x)
      {
      return log2(x);
      }
  
      float power(float x, float y)
       {
      return pow(x,y);
      }
  
      float fmodu(float x, float y)
       {
       return fmod(x,y);
        }
  </code></pre>