A Scientific Calculator in C using functions
38,135
Solution 1
You have declared these four variables as integers:
int x,y,n,answer;
but n
is the only one that you actually treat as an integer. Declare x
, y
and answer
as float
:
int n;
float x, y, answer;
Solution 2
#include <stdio.h>
#include <math.h>
#include<conio.h>
#define PI 3.14159265
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));
}
float sineh(float x)
{
return (sinh(x));
}
float cosineh(float x)
{
return (sinh(x));
}
float tangenth(float x)
{
return (sinh(x));
}
float logten(float x)
{
return (log10(x));
}
float squareroot(float x)
{
return (sqrt(x));
}
float exponent(float x)
{
return(exp(x));
}
float power(float x, float y)
{
return (pow(x,y));
}
int main(void)
{
int n;
float x,y,answer;
printf("What do you want to do?\n");
printf("1.sin 2.cos 3. tan 4. sinh 5.cosh 6.tanh 7.1og10 8. square root.
9.exponent 10.power.");
scanf ("%d",&n);
if (n<9 && n>0)
{
printf("\n What is x? ");
scanf("%f",&x);
switch (n)
{
case 1: answer = sine(x); break;
case 2: answer = cosine(x); break;
case 3: answer = tangent(x); break;
case 4: answer = sineh(x); break;
case 5: answer = cosineh(x); break;
case 6: answer = tangenth(x); break;
case 7: answer = logten(x); break;
case 8: answer = squareroot(x); break;
case 9: answer = exponent(x); break;
}
}
if (n==10)
{
printf("What is x and y?\n");
scanf("%f%f",&x,&y);
answer = power(x,y);
}
if (n>0 && n<11)
printf("%f",answer);
else
printf("Wrong input.\n");
getch();
return 0;
}
Solution 3
If I enable -Wall and -Wconversion, I see the following warnings, which, if you solved, would solve your problem:
foo.c:23:14: warning: format specifies type 'float *' but the argument has type 'int *' [-Wformat]
scanf("%f",&x);
~~ ^~
%d
foo.c:26:21: warning: implicit conversion turns floating-point number into integer: 'float' to 'int' [-Wconversion]
case 1: answer = sine(x); break;
~ ^~~~~~~
foo.c:27:21: warning: implicit conversion turns floating-point number into integer: 'float' to 'int' [-Wconversion]
case 2: answer = cosine(x); break;
~ ^~~~~~~~~
foo.c:28:21: warning: implicit conversion turns floating-point number into integer: 'float' to 'int' [-Wconversion]
case 3: answer = tangent(x); break;
~ ^~~~~~~~~~
foo.c:29:21: warning: implicit conversion turns floating-point number into integer: 'float' to 'int' [-Wconversion]
case 4: answer = sineh(x); break;
~ ^~~~~~~~
foo.c:30:21: warning: implicit conversion turns floating-point number into integer: 'float' to 'int' [-Wconversion]
case 5: answer = cosineh(x); break;
~ ^~~~~~~~~~
foo.c:31:21: warning: implicit conversion turns floating-point number into integer: 'float' to 'int' [-Wconversion]
case 6: answer = tangenth(x); break;
~ ^~~~~~~~~~~
foo.c:32:21: warning: implicit conversion turns floating-point number into integer: 'float' to 'int' [-Wconversion]
case 7: answer = logten(x); break;
~ ^~~~~~~~~
foo.c:33:21: warning: implicit conversion turns floating-point number into integer: 'float' to 'int' [-Wconversion]
case 8: answer = squareroot(x); break;
~ ^~~~~~~~~~~~~
foo.c:34:21: warning: implicit conversion turns floating-point number into integer: 'float' to 'int' [-Wconversion]
case 9: answer = exponent(x); break;
~ ^~~~~~~~~~~
foo.c:40:16: warning: format specifies type 'float *' but the argument has type 'int *' [-Wformat]
scanf("%f%f",&x,&y);
~~ ^~
%d
foo.c:40:19: warning: format specifies type 'float *' but the argument has type 'int *' [-Wformat]
scanf("%f%f",&x,&y);
~~ ^~
%d
foo.c:41:12: warning: implicit conversion turns floating-point number into integer: 'float' to 'int' [-Wconversion]
answer = power(x,y);
~ ^~~~~~~~~~
foo.c:44:15: warning: format specifies type 'double' but the argument has type 'int' [-Wformat]
printf("%f",answer);
~~ ^~~~~~
%d
foo.c:51:10: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wconversion]
return (sin (x*PI/180));
~~~~~~ ^~~~~~~~~~~~~~
foo.c:55:10: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wconversion]
return (cos (x*PI/180));
~~~~~~ ^~~~~~~~~~~~~~
foo.c:59:10: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wconversion]
return (tan(x*PI/180));
~~~~~~ ^~~~~~~~~~~~~
foo.c:63:10: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wconversion]
return (sinh(x));
~~~~~~ ^~~~~~~
foo.c:67:10: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wconversion]
return (sinh(x));
~~~~~~ ^~~~~~~
foo.c:71:10: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wconversion]
return (sinh(x));
~~~~~~ ^~~~~~~
foo.c:75:10: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wconversion]
return (log10(x));
~~~~~~ ^~~~~~~~
foo.c:79:10: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wconversion]
return (sqrt(x));
~~~~~~ ^~~~~~~
foo.c:83:9: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wconversion]
return(exp(x));
~~~~~~ ^~~~~~
foo.c:87:10: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wconversion]
return (pow(x,y));
~~~~~~ ^~~~~~~~
24 warnings generated.
Solution 4
You declared x
and other variables as int
. Try declaring as float
instead
Comments
-
Shail almost 2 years
I wrote a program which used most of the math.h library functions for creating a sort of scientific calculator. However, I am not getting the desired output. I always get 0.000000 in the end of the output. Please help me identify my mistake, Thank you.
#include <stdio.h> #include <math.h> #define PI 3.14159265 float sine(float x); float cosine(float x); float tangent(float x); float sineh(float x); float cosineh(float x); float tangenth(float x); float logten(float x); float squareroot(float x); float exponent(float x); float power(float x,float y); int main() { int x,y,n,answer; printf("What do you want to do?\n"); printf("1.sin 2.cos 3. tan 4. sinh 5.cosh 6.tanh 7.1og10 8. square root. 9.exponent 10.power."); scanf ("%d",&n); if (n<9 && n>0) { printf("\n What is x? "); scanf("%f",&x); switch (n) { case 1: answer = sine(x); break; case 2: answer = cosine(x); break; case 3: answer = tangent(x); break; case 4: answer = sineh(x); break; case 5: answer = cosineh(x); break; case 6: answer = tangenth(x); break; case 7: answer = logten(x); break; case 8: answer = squareroot(x); break; case 9: answer = exponent(x); break; } } if (n==10) { printf("What is x and y?\n"); scanf("%f%f",&x,&y); answer = power(x,y); } if (n>0 && n<11) printf("%f",answer); else printf("Wrong input.\n"); 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 sineh(float x) { return (sinh(x)); } float cosineh(float x) { return (sinh(x)); } float tangenth(float x) { return (sinh(x)); } float logten(float x) { return (log10(x)); } float squareroot(float x) { return (sqrt(x)); } float exponent(float x) { return(exp(x)); } float power(float x, float y) { return (pow(x,y)); }