MIPS assembly calculating hypotenuse -

i have mips program compute hypotenuse 2 integers. program prints weird number not actual result, best guess there wrong square root function.

    .data prompt1: .asciiz "enter value a: " prompt2: .asciiz "enter value b: " result:  .asciiz "the hypotenuse is: "      .text main:          # save $ra          addi $sp, $sp, -4          sw $ra, 0($sp)           # accept input          la $a0, prompt1          addi $v0, $0, 4         # print prompt1 string          syscall          addi $v0, $0, 6         # read float          syscall          add.s $f12, $f5, $f0     # f12 = a(input float)           la $a0, prompt2          addi $v0, $0, 4         # print prompt2 string          syscall          addi $v0, $0, 6         # read float          syscall          add.s $f13, $f5, $f0     # f13 = b(input float)  hypotenuse:     mul.s   $f12, $f12, $f12        # a*a     mul.s   $f13, $f13, $f13        # b*b     add.s   $f12, $f12, $f13        # a*a + b*b     addi    $sp, $sp, -4            # allocate     sw  $ra 0($sp)      add.s   $f0, $f12, $f12     jal sqrt     li  $v0, 3      # print double          syscall         # print area     lw  $ra 0($sp)     addi    $sp, $sp, 4         # de-allocate     mov.s   $f0, $f12     jr  $ra  sqrt:   add $v0, $zero, 0   # r := 0 loop:   mul $t0, $v0, $v0   # t0 := r*r     bgt $t0, $a0, end   # if (r*r > n) goto end     addi    $v0, $v0, 1 # r := r + 1     j   loop        # goto loop end:    addi    $v0, $v0, -1    # r := r - 1     jr  $ra     # return r-1 in $v0  # exit     li $v0, 10      # loads op code $v0 exit program     syscall         # reads $v0 , exits program 

your sqrt function returns bogus value, because before call calculate a*a + b*b in register $f0, function performs integer arithmetic on register $v0, contains junk.