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#include <stdio.h>
#include <ctype.h>
 
float bmi_calc(float height, float weight) {
	return weight/(height * height);
}
 
int main(void) {
	printf("Input your height(m) and weight(kg) in decimals");
	float height, weight, bmi;
	scanf("%f, %f", &height, %weight);
	bmi = bmi_calc(height, weight);
	printf(" BMI equals %f", bmi);
	if (bmi < 15) {
		printf("\nSeverely underweight");
	}
	else if (bmi < 18.5) {
		printf("\nUnderweight ");
	}
	else if (bmi >= 18.5 && bmi < 24.9); {
	printf("\nNormal weight");
}
else if (bmi >= 25 && bmi < 29.9) {
	printf("\nOverweight");
}
else if (bmi >= 30) {
	prinf("\nObesity");
}
}

prog.c: In function ‘main’:
prog.c:11:27: error: expected expression before ‘%’ token
  scanf("%f, %f", &height, %weight);
                           ^
prog.c:20:2: warning: this ‘else’ clause does not guard... [-Wmisleading-indentation]
  else if (bmi >= 18.5 && bmi < 24.9); {
  ^~~~
prog.c:20:39: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘else’
  else if (bmi >= 18.5 && bmi < 24.9); {
                                       ^
prog.c:23:1: error: ‘else’ without a previous ‘if’
 else if (bmi >= 25 && bmi < 29.9) {
 ^~~~
prog.c:27:2: warning: implicit declaration of function ‘prinf’ [-Wimplicit-function-declaration]
  prinf("\nObesity");
  ^~~~~

Standard output is empty