debugging - Getting invalid operand to binary error in C Mandelbrot Program -
i'm supposed write program in c create mandelbrot. have specific instructions follow , i'm pretty sure have followed them correctly. question have when try compile code gcc (using make command) error says:
mason> make gcc -c main.c main.c: in function ‘main’: main.c:13:40: error: invalid operands binary < (have ‘complex_t’ , ‘int’) i have been having lot of issues complex_t in order make double mandelbrot print. if please see if can find error keep missing. here code files:
main.c (where error is):
#include <stdio.h> #include "complex.h" #include "mandelbrot.h" int main (void) { complex_t c; (c.imag = -1.2; c.imag < 2.8; c.imag+= 0.05) { (c.real = -2.1; c.real < -0.66; c.real+= 0.032) { if (abs_complex(mandelbrot(15,c)) > 100) { printf("-"); } else printf("#"); } printf("\n"); } return (0); } mandelbrot.c:
#include "complex.h" #include "mandelbrot.h" complex_t mandelbrot(int n, complex_t c) { complex_t m = {100,100}; complex_t tmp; if (n == 0) { return c; } else if (abs_complex(mandelbrot(n-1,c) > 1000)) { return m; } else { tmp = mandelbrot(n-1,c); tmp = cmult(tmp, tmp); tmp = cadd(tmp,c); } return tmp; } mandelbrot.h:
complex_t mandelbrot(int n, complex_t c); complex.c:
#include <stdio.h> #include <math.h> #include "complex.h" /* * complex number input function returns standard scanning error code * 1 => valid scan, 0 => error, negative eof value => end of file */ int scan_complex(complex_t *c) /* output - address of complex variable fill */ { int status; status = scanf("%lf%lf", &c->real, &c->imag); if (status == 2) status = 1; else if (status != eof) status = 0; return (status); } /* * complex output function displays value (a + bi) or (a - bi), * dropping or b if round 0 unless both round 0 */ void print_complex(complex_t c) /* input - complex number display */ { double a, b; char sign; = c.real; b = c.imag; printf("("); if (fabs(a) < .005 && fabs(b) < .005) { printf("%.2f", 0.0); } else if (fabs(b) < .005) { printf("%.2f", a); } else if (fabs(a) < .005) { printf("%.2fi", b); } else { if (b < 0) sign = '-'; else sign = '+'; printf("%.2f %c %.2fi", a, sign, fabs(b)); } printf(")"); } /* * returns sum of complex values c1 , c2 */ complex_t add_complex(complex_t c1, complex_t c2) /* input - values add */ { complex_t csum; csum.real = c1.real + c2.real; csum.imag = c1.imag + c2.imag; return (csum); } /* * returns difference c1 - c2 */ complex_t subtract_complex(complex_t c1, complex_t c2) /* input parameters */ { complex_t cdiff; cdiff.real = c1.real - c2.real; cdiff.imag = c1.imag - c2.imag; return (cdiff); } /* ** stub ** * returns product of complex values c1 , c2 */ complex_t multiply_complex(complex_t c1, complex_t c2) /* input parameters */ { complex_t cmul; double a, b, c, d; = c1.real; b = c1.imag; c = c2.real; d = c2.imag; if (( b > 0 && d < 0) || (b < 0 && d > 0)) { cmul.real - (a*c) + (fabs(b)*fabs(d)); cmul.imag = (a*d) + (b*c); } else if (( b>0 && d>0) || (b<0 && d<0)) { cmul.real = (a*c) - (b*d); cmul.imag = (a*d) + (b*c); } return (cmul); } /* ** stub ** * returns quotient of complex values (c1 / c2) */ complex_t divide_complex(complex_t c1, complex_t c2) /* input parameters */ { complex_t cdiv; double a, b, c, d; = c1.real; b = c1.imag; c = c2.real; d = c2.imag; if ( b > 0 && d < 0) { cdiv.real = (a*c) - (fabs(b)*fabs(d)) / ((c*c) + (d*d)); cdiv.imag = (a*d) + (b*c) / ((c*c) + (d*d)); } else if ( b>0 && d>0) { cdiv.real = (a*c) - (fabs(b)*fabs(d)) / ((c*c) + (d*d)); cdiv.imag = ((-1*a*d) + (b*c)) / ((c*c) + (d*d)); } else if (b<0 && d<0) { cdiv.real = (a*c) + (fabs(b)*fabs(d)) / ((c*c) + (d*d)); cdiv.imag = ((-1*a*d) + (b*c)) / ((c*c) + (d*d)); } else if (b<0 && d<0) { cdiv.real = (a*c) + (fabs(b)*fabs(d)) / ((c*c) + (d*d)); cdiv.imag = ((a*fabs(d)) + (b*c)) / ((c*c) + (d*d)); } return (cdiv); } /* * returns absolute value of complex number c */ double abs_complex(complex_t c) /* input parameter */ { complex_t cabs; cabs.real = sqrt(c.real * c.real + c.imag * c.imag); return (cabs.real); } complex.h:
typedef struct { double real, imag; } complex_t; int scan_complex(complex_t *c); void print_complex(complex_t c); complex_t add_complex(complex_t c1, complex_t c2); complex_t subtract_complex(complex_t c1, complex_t c2); complex_t multiply_complex(complex_t c1, complex_t c2); complex_t divide_complex(complex_t c1, complex_t c2); complex_t abs_complex(complex_t c);
your header complex.h declares:
complex_t abs_complex(complex_t c); your implementation complex.c defines:
double abs_complex(complex_t c) { so what's happening code won't compile because abs_complex in header file saying returns complex_t , not double.
presumably complex.c doesn't compile because of mismatched definition/declaration.
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