c - One digit after the decimal point in input -

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this question has answer here:

how can take floating point number 1 digit after decimal point (0.1) using scanf in c language ? example user may type 3.25405... in variable 3.2 saved . how can ? different rounding floating point number .

read using fgets() , post-process buffer. @devsolar

char buf[100]; if (fgets(buf, sizeof buf, stdin) == null) handle_eof(); char *p = strchr(buf,'.'); if (p && isdigit(p[1])) p[2] = 0; char *endptr; double y = strtod(buf, &endptr); ...

even better alert user of ignored additional input.

if (p && isdigit(p[1])) {   if (p[2] && p[2] != '\n') puts("extra input ignored.");   p[2] = 0; } char *endptr; double y = strtod(buf, &endptr);

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