35 lines
584 B
Bash
35 lines
584 B
Bash
#!/bin/ksh
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# Increment loop index within loop body
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# # Variables:
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#
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integer INDX_START=42 N_PRIMES=42
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# # Functions:
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#
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# # Function _isprime(n) return 1 for prime, 0 for not prime
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#
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function _isprime {
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typeset _n ; integer _n=$1
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typeset _i ; integer _i
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(( _n < 2 )) && return 0
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for (( _i=2 ; _i*_i<=_n ; _i++ )); do
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(( ! ( _n % _i ) )) && return 0
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done
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return 1
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}
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######
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# main #
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######
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integer i n=0
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for ((i=INDX_START; n<N_PRIMES; i++)); do
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_isprime ${i}
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if (( $? )); then
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printf "%,18d is prime, %2d primes found(so far)\n" ${i} $((++n))
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(( i+=$i ))
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fi
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done
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