73 lines
1.2 KiB
NASM
73 lines
1.2 KiB
NASM
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.data
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.eqv SIZE, 20
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.eqv print_string, 4
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.eqv read_string, 8
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str: .space 21
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str1: .asciiz "Introduza uma string: "
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.text
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.globl main
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# Mapa de registos
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# $t0: p
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# $t1: *p
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main: li $v0, print_string
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la $a0, str1
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syscall # print_string("Introduza uma string: ");
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la $a0, str
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li $a1, SIZE
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li $v0, read_string
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syscall # read_string(str, SIZE);
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# --- CONVERTER PARA MAIÚSCULAS ---
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la $t0, str # p = str;
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while1: lb $t1, 0($t0)
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beq $t1, 0x00, endw1 # while (*p != '\0') {
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if1: blt $t1, 0x61, else1 # if (*p >= 'a')
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bgt $t1, 0x7A, else1 # if (*p <= 'z')
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addiu $t1, $t1, -0x20 # *p = *p - 'a' + 'A';
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sb $t1, 0($t0)
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else1: addiu $t0, $t0, 1 # p++
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j while1 # }
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endw1: li $v0, print_string
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la $a0, str
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syscall
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# ---------------------------------
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li $v0, 11
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li $a0, '\n'
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syscall
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# --- CONVERTER PARA MINÚSCULAS ---
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la $t0, str # p = str;
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while2: lb $t1, 0($t0)
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beq $t1, 0x00, endw2 # while (*p != '\0') {
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if2: blt $t1, 0x41, else2 # if (*p >= 'a')
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bgt $t1, 0x5A, else2 # if (*p <= 'z')
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addiu $t1, $t1, 0x20 # *p = *p - 'a' + 'A';
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sb $t1, 0($t0)
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else2: addiu $t0, $t0, 1 # p++
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j while2 # }
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endw2: li $v0, print_string
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la $a0, str
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syscall
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# ---------------------------------
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jr $ra
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