Update du1/program.c
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#include <stdio.h>
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int main(){
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int c= 0;
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while(1){
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c = getchar();
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if (c < 0) break;
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if (c >= 97 && c <= 122){
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c = c - 'a' + 'A';
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} else
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if (c >= 65 && c <= 90){
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c = c - 'A' + 'a';
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}
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putchar(c);
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}
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return 0;
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}
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