40 lines
880 B
NASM
40 lines
880 B
NASM
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.eqv SIZE,20
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.data
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str: .space 21
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.text
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.globl main
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# Mapa de registos
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# num: $t0
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# i: $t1
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# str: $t2
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# str+i: $t3
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# str[i]: $t4
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main: la $a0,str
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li $a1,SIZE
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li $v0,8
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syscall # read_string(str,SIZE)
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li $t0,0 # num = 0
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li $t1,0 # i = 0
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while: la $t2,str # $t2=&str[0] <=> $t2=str
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addu $t3,$t2,$t1 # $t3=&str[i] <=> $t3=str+i
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lb $t4,0($t3) # $t4=str[i]
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beq $t4,'\0',endw # if (str[i]=='\0') goto endw
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if: blt $t4,'0',endif
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bgt $t4,'9',endif
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addi $t0,$t0,1 # num++
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endif: addi $t1,$t1,1 # i++
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j while
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endw: move $a0,$t0
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li $v0,1
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syscall
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jr $ra
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