Rounding off to odd multiples of 25

variable X varies as 25:50:125875

A= "Enter a value of X"

I must round off the value of A (user input) to match certain X value.

I need if A = anything ending with 75 or 25 : aceept it if A = anything ending with values(26-49) : floor it to the value ending with 25, just before if A = anything ending with values(51-74) : ceiling it to the value ending with 75, just after

Answer 1

[Guillaume]

It's fairly straightforward, subtract 25, divide by 50, round to nearest integer and then multiply back by 50 and readd the 25:

 >>roundspecial = @(x) 25+50.*round((x-25)./50);

 >>roundspecial(25)
 ans = 
     25

 >>rounspecial(26)
 ans = 
     25

 >>roundspecial(49)
 ans = 
     25

 >>roundspecial(50)
 ans = 
     75

>>roundspecial(374)
ans = 
    375

[Utsav]

I am so very thankful to you Sir for the kind help extended to me in this regard.