Linear Algebra and the C Language/a0e8

__NOTOC__ Install and compile this file in your working directory. /* ------------------------------------ */ /* Save as : c00d.c */ /* ------------------------------------ */ #include "v_a.h" /* ------------------------------------ */ /* ------------------------------------ Positive and negative floating point number e= 1E-0 -> 1234 e = 1E-1 -> 123.4 e = 1E-2 -> 12.34 e = 1E-3 -> 1.234 ------------------------------------ */ double X_r_E( int maxI, double e) { double x; x = (rand() % maxI) + 1 ; /* + 1 : not zero */ x *= pow(-1,rand()) * e; /* sign + or - */ return(x); } /* ------------------------------------ */ /* ------------------------------------ */ int main(void) { time_t t; srand(time(&t)); do{ clrscrn(); printf(" Decimal numbers: \n"); printf(" r_E(999, 1e-3): %+0.3f\n\n\n", r_E(999, 1e-3)); printf(" Scientific Notation : %%+0.3E ... \%%+0.3e \n\n"); printf(" Positive and negative numbers: \n"); printf(" r_E(999, 1e-3): %+0.3e \n", r_E(999, 1e-3)); printf(" r_E(999, 1E+3): %+0.3E\n\n\n", r_E(999, 1E+3)); printf(" Positive numbers: \n"); printf(" rp_E(999, 1e-3): %+0.3e \n", rp_E(999, 1e-3)); printf(" rp_E(999, 1E+3): %+0.3E\n\n\n", rp_E(999, 1E+3)); }while(stop_w()); return 0; } /* ------------------------------------ */ /* ------------------------------------ */ I rename the function studied with the prefix X_ to differentiate it from the one with the same name in the library. Screen output example: Decimal numbers: r_E(999, 1e-3): +0.183 Scientific Notation : %+0.3E ... %+0.3e Positive and negative numbers: r_E(999, 1e-3): -4.940e-01 r_E(999, 1E+3): +8.880E+05 Positive numbers: rp_E(999, 1e-3): +8.070e-01 rp_E(999, 1E+3): +8.360E+05 Press return to continue Press X return to stop