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int countdigit (int number,int digit){ int d,n,count=0; n=number; while (n!=0){ d=n%10; n=n/10; if (d==digit) count ++;} return count; } #include<stdio.h> int main(void) { int x,t; printf("Input an integer: "); x=123; t=countdigit(x,2); printf("Number of digit 2: %d",t); }
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