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Posted by Strom Thu 19th Aug 18:02

001 002 003 004 005 006 007 008 009 010 011 012 013 014 015 016 017 018 019 020 021 022 023 024 025 026 027 028 029 030 031 032 033 034 035 036 037 038 039 040 041 042 043 044 045 #include <stdio.h> #include <stdlib.h> int main(int argc, char **argv) { char *xT = "29.00000"; char *x = "23.20000"; char *xR = "5.800000"; double dT = strtod(xT, NULL); double d = strtod(x, NULL); double dR = strtod(xR, NULL); printf("Parsing '%s' to %.20f=%10f=%f\n", xT, dT,dT,dT); printf("Parsing '%s' to %.20f=%10f=%f\n", x, d,d,d); printf("Parsing '%s' to %.20f=%10f=%f\n", xR, dR,dR,dR); printf("Is %.2f == %2f-%2f? ", dR, dT, d); if(dR == (dT - d)) printf("Yes, proper calculation!\n"); else printf("No :( Fail calc \n"); printf("Is %.2f-%2f == %2f? ", dT, dR, d); if(dT-dR == d) printf("Yes, proper calculation!\n"); else printf("No :( Fail calc \n"); return 0; } $ gcc -O test.c -o test -Wall && ./test Parsing '29.00000' to 29.00000000000000000000= 29.000000=29.000000 Parsing '23.20000' to 23.19999999999999928946= 23.200000=23.200000 Parsing '5.800000' to 5.79999999999999982236= 5.800000=5.800000 Is 5.80 == 29.000000-23.200000? No :( Fail calc Is 29.00-5.800000 == 23.200000? Yes, proper calculation!

The following amendments have been posted:

Strom (Thu 19th Aug 18:58)

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#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
        char *xT = "29.00000";
        char *x = "23.20000";
        char *xR = "5.800000";
        double dT = strtod(xT, NULL);
        double d = strtod(x, NULL);
        double dR = strtod(xR, NULL);

        printf("Parsing '%s' to %.20f=%10f=%f\n",
                        xT,
                        dT,dT,dT);
        printf("Parsing '%s' to %.20f=%10f=%f\n",
                        x,
                        d,d,d);
        printf("Parsing '%s' to %.20f=%10f=%f\n",
                        xR,
                        dR,dR,dR);

        printf("Is %.2f == %2f-%2f? ", dR, dT, d);
        if(dR == (dT - d))
                printf("Yes, proper calculation!\n");
        else            printf("No :( Fail calc \n");

        printf("Is %.2f-%2f == %2f? ", dT, dR, d);
        if(dT-dR == d)
                printf("Yes, proper calculation!\n");
        else            printf("No :( Fail calc \n");
        return 0;
}






$ gcc -O test.c -o test -Wall &&  ./test
Parsing '29.00000' to 29.00000000000000000000= 29.000000=29.000000
Parsing '23.20000' to 23.19999999999999928946= 23.200000=23.200000
Parsing '5.800000' to 5.79999999999999982236=  5.800000=5.800000
Is 5.80 == 29.000000-23.200000? No :( Fail calc 
Is 29.00-5.800000 == 23.200000? Yes, proper calculation!

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Posted by Strom Thu 19th Aug 18:02