Question:C code to convert one unit to other unit 

Answer 
#include<stdio.h>
#include<math.h>

int main(){
   
    char fromUnit,toUnit;
    char *fUnit,*tUnit;
    long double fromValue,meterValue,toValue;
    int power =0;

    printf("To convert the 12 Inch to Foot\n");
    printf("enter the the unit in the format : dc12\n");

    printf("Ell: a\n");
    printf("Femi: b\n");
    printf("Foot: c\n");
    printf("Inch: d\n");
    printf("Light year: e\n");
    printf("Metre: f\n");
    printf("Mile: g\n");
    printf("Nano meter: h\n");
    printf("Pace: i\n");
    printf("Point: j\n");
    printf("Yard: k\n");
    printf("Mili meter: l\n");
    printf("Centi meter: m\n");
    printf("Deci meter: n\n");
    printf("Deca meter: o\n");
    printf("Hecto meter: p\n");
    printf("Kilo meter: q\n");

    scanf("%c%c%Lf",&fromUnit,&toUnit,&fromValue); 

    switch(fromUnit){
         case 'a': meterValue = fromValue * 1.143; fUnit="ell"; break;
         case 'b': meterValue = fromValue ; power = -15; fUnit="fm"; break;
         case 'c': meterValue = fromValue * 0.3048; fUnit="ft"; break;
         case 'd': meterValue = fromValue * 0.0254; fUnit="in"; break;
         case 'e': meterValue = fromValue * 9.4607304725808; power =15; fUnit="ly"; break;
         case 'f': meterValue = fromValue; fUnit="m"; break;
         case 'g': meterValue = fromValue * 1609.344; fUnit="mi"; break;
         case 'h': meterValue = fromValue; fUnit="nm"; power = -9; break;
         case 'i': meterValue = fromValue * 0.762 ; fUnit="pace"; break;
         case 'j': meterValue = fromValue * 0.000351450; fUnit="pt"; break;
         case 'k': meterValue = fromValue * 0.9144; fUnit="yd"; break;
         case 'l': meterValue = fromValue * 0.001; fUnit="mm"; break;
         case 'm': meterValue = fromValue * 0.01; fUnit="cm"; break;
         case 'n': meterValue = fromValue * 0.1; fUnit="deci meter"; break;
         case 'o': meterValue = fromValue * 10; fUnit="deca meter"; break;
         case 'p': meterValue = fromValue * 100; fUnit="hm"; break;
         case 'q': meterValue = fromValue * 1000; fUnit="km"; break;
         default:
             printf("Invalid input"); exit(0);
    }

    switch(toUnit){
         case 'a': toValue = meterValue/1.143; tUnit="ell"; break;
         case 'b': toValue = meterValue; tUnit="fm"; break;
         case 'c': toValue = meterValue/0.3048; tUnit="ft"; break;
         case 'd': toValue = meterValue/0.0254; tUnit="in"; break;
         case 'e': toValue = meterValue/9.4607304725808; tUnit="ly"; break;
         case 'f': toValue = meterValue; tUnit="m";break;
         case 'g': toValue = meterValue/1609.344; tUnit="mi"; break;
         case 'h': toValue = meterValue; tUnit="nm"; break;
         case 'i': toValue = meterValue/0.762; tUnit="pace"; break;
         case 'j': toValue = meterValue/0.000351450; tUnit="pt"; break;
         case 'k': toValue = meterValue/0.9144; tUnit="yd"; break;
         case 'l': toValue = meterValue/0.001; tUnit="mm"; break;
         case 'm': toValue = meterValue/0.01; tUnit="cm"; break;
         case 'n': toValue = meterValue/0.1; tUnit="deci meter"; break;
         case 'o': toValue = meterValue/10; tUnit="deca meter"; break;
         case 'p': toValue = meterValue/100; tUnit="hm"; break;
         case 'q': toValue = meterValue/1000; tUnit="km"; break;
         default:
             printf("Invalid input"); exit(0);
    }
   
    if(power==0)
         printf("%.4Lf %s = %.4Lf %s",fromValue,fUnit,toValue,tUnit);
    else{
         while(tovalue > 10 
         printf("%.4Lf %s = %.4Lf*10^%d %s",fromValue,fUnit,toValue,power,tUnit);
    }


    return 0;
}
 

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