validation - Vector Input Using Scanf (C language) -


first time user of stackoverflow, long time visitor. thought prudent start being more involved. first, have small question :)

basically i'm trying take in 3 numbers (can positive, negative or decimal) each separated space (x y z) using scanf , placed array/struct (ignoring spaces), , returning error message if user not input explicitly numbers or input them in incorrect format. possible scanf? alternative?

i've searched around @ different questions asked couldn't find answer understand (first timer c). link, explanation or little bit of example code appreciated :)

it sounds though want 3 numbers on 1 line; having them spread on multiple lines not acceptable. you've not indicated should happen if there's fourth number on line.

using plain scanf(), difficult, if not impossible, control this. using fgets() , sscanf() feasible:

char line[4096]; while (fgets(line, sizeof(line), stdin) != 0) {     double v1, v2, v3;     if (sscanf(line, "%g %g %g", &v1, &v2, &v3) != 3)         ...format error...     ...save v1, v2, v3 structure or array... }

optionally, can find out conversion finished , check there no debris on line after 3 numbers.


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