char f [4][8] = {"123.45", "546.87", "45.997", "65.43"};

void setup() {


  // put your setup code here, to run once:
  Serial.begin(115200);

  for (int i = 0; i < 4; i++) {
    float a = atof(f[i]);//ascii to float
    Serial.println(a);
  }

}

void loop() {
  // put your main code here, to run repeatedly:

}